About Australian Decimal Paper Banknotes
GRADING...
Digital Microscope UNC Seven-Tier Grading Framework
Purpose:
To define UNC banknotes across seven internal quality tiers using careful visual inspection, handling discipline, light-angle review, and digital microscope assessment.
Core grading principle:
UNC does not simply mean the note never entered circulation.
UNC means the note shows no true circulation wear when assessed for paper quality, folds, handling, corners, edges, surface condition, freshness, originality and eye appeal.
Master line:
UNC tells us the note shows no circulation wear.
The tier tells us how fresh, original and desirable that UNC note really is.
1. Digital Microscope Grading Position
A digital microscope is used to inspect fine detail that may not be clearly visible to the naked eye.
The microscope may reveal:
Finger marks
Surface disturbance
Pressed areas
Paper fibre disruption
Micro-folds
Counting pressure
Teller flicks
Corner stress
Edge weakness
Foxing spots
Toning patches
Dirt in fibres
Ink disturbance
Embossing weakness
Storage pressure
Sleeve rub
Album marks
Pinpoint contamination
Possible cleaning or flattening evidence
This is why grading is not a glance.
Grading is a procedure.
2. Standard Grading Bench Procedure
Each note should be assessed in stages.
Stage 1 - Naked Eye Review
Look at the whole note first.
Check:
Overall eye appeal
Freshness
Colour
Obvious folds
Obvious stains
Obvious foxing
Obvious toning
Corners
Edges
Centred appearance
General presentation
Stage 2 - Light-Angle Review
Tilt the note carefully under light.
Look for:
Soft bends
Counting marks
Teller flicks
Pressed folds
Surface gloss changes
Finger marks
Paper waves
Embossing
Handling pressure
Hidden creases
Stage 3 - Digital Microscope Review
Use the microscope to inspect:
Corners
Edges
High-contact areas
Portrait areas
White margins
Serial-number areas
Fold-prone zones
Embossed print
Suspected marks
Foxing or toning spots
Paper fibres
Stage 4 - Tier Decision
Assign the note to the lowest tier supported by the evidence.
If a note has Tier:6 freshness but Tier:3 handling evidence, it cannot be Tier:6.
The defect controls the ceiling.
UNC Tier:1
Deficient UNC / Weak UNC
Position:
This is the lowest acceptable UNC tier.
The note shows no true circulation wear, but it has enough weaknesses to make it poor-quality UNC.
It may be technically uncirculated, but visually it is weak.
Naked Eye Signs
May show:
Dull paper appearance
Weak freshness
Minor storage toning
Light general haze
Average or tired eye appeal
Slightly soft corners
Minor edge weakness
Faint handling signs
Poor album presentation
Flat or lifeless paper look
Microscope Findings
The digital microscope may reveal:
Light finger residue
Minor fibre dullness
Small edge pressure marks
Tiny corner stress
Surface rubbing from storage
Light album pressure
Minute handling contact
Minor ink surface disturbance
Small foxing beginnings
Paper fibres that appear tired or compressed
Defects Allowed
Tier:1 may tolerate:
Light storage marks
Minor handling evidence
Faint teller flick
Light counting pressure
Minor corner softness
Light toning
Very small foxing risk
Minor edge weakness
Defects Not Allowed
If the note has:
Clear circulation fold
Heavy staining
Strong foxing
Obvious dirt
Major paper damage
Tears
Pinholes
Heavy creasing
Obvious cleaning
then it should not remain UNC Tier:1. It should fall outside UNC.
Tier:1 Rule
Technically UNC, but visibly deficient.
Internal Line
UNC by definition, but not by excitement.
UNC Tier:2
Commercial UNC
Position:
This is normal commercial UNC.
The note is saleable and acceptable, but it is not premium.
This is the kind of UNC many dealers may sell without much explanation.
Naked Eye Signs
Should show:
No obvious circulation folds
Generally clean paper
Acceptable colour
Reasonable corners
Decent presentation
Minor storage evidence only
General collector appeal
But it may lack:
Strong freshness
Sharpness
Premium eye appeal
Exceptional paper quality
Microscope Findings
The digital microscope may reveal:
Minor fibre compression
Small corner contact
Light edge pressure
Minimal sleeve rub
Tiny surface marks
Light handling evidence
Small dullness in white areas
Minor teller or counting pressure not visible at first glance
Defects Allowed
Tier:2 may tolerate:
Minor storage dullness
Minor corner softness
Very slight paper handling
Light edge pressure
Small natural production marks
Minor counting pressure
Non-distracting surface marks
Defects Not Allowed
Tier:2 should not show:
Obvious finger marks
Clear foxing
Strong toning
Any true fold
Heavy teller flick
Noticeable paper disturbance
Poor visual appeal
Tier:2 Rule
Saleable UNC, but not premium UNC.
Internal Line
Good enough to sell, not good enough to brag about.
UNC Tier:3
Standard UNC
Position:
This is a proper, honest UNC note.
It is suitable for most collectors seeking a clean uncirculated example.
Naked Eye Signs
Should show:
Clean paper
Good colour
No folds
Good corners
Good edges
Decent freshness
Respectable eye appeal
No major distractions
Good overall balance
Microscope Findings
The digital microscope may reveal:
Very minor natural paper fibre irregularities
Very small production tolerance marks
Tiny edge contact from storage
Minor but acceptable corner contact
Clean surface overall
No obvious handling contamination
No meaningful finger residue
Defects Allowed
Tier:3 may tolerate:
Very minor natural production marks
Very light storage evidence
Extremely minor edge/corner contact
Tiny surface specks if not distracting
Minor paper wave if natural
Defects Not Allowed
Tier:3 should not show:
Visible finger marks
Visible foxing
Noticeable toning
Counting folds
Teller flicks
Surface rub
Album pressure marks
Weak eye appeal
Corners that look tired
Tier:3 Rule
Solid UNC with no major concern.
Internal Line
A good honest UNC note.
UNC Tier:4
Better UNC
Position:
This is above-average UNC.
The note is clearly stronger than ordinary commercial UNC and should appeal to more selective collectors.
Naked Eye Signs
Should show:
Fresh paper
Strong colour
Sharper corners
Clean edges
Good brightness
Better eye appeal
No visible handling
No obvious storage dullness
Attractive original look
Microscope Findings
The digital microscope should confirm:
Clean paper fibres
Minimal surface disturbance
No finger residue
No foxing
No meaningful toning
Sharp corner structure
Clean edge line
Good ink surface
Natural embossing still visible where expected
Defects Allowed
Tier:4 may tolerate:
Tiny production speck
Very minor natural paper wave
Microscopic edge irregularity
Small non-distracting production mark
Defects Not Allowed
Tier:4 should not show:
Finger marks
Teller flicks
Counting pressure
Any fold line
Foxing
Noticeable toning
Storage fatigue
Album rub
Flattening signs
Tier:4 Rule
Noticeably better than ordinary UNC.
Internal Line
This is where UNC starts to look strong.
UNC Tier:5
Choice UNC
Position:
This is high-grade collector UNC.
A Tier:5 note should feel fresh, strong and desirable.
Naked Eye Signs
Should show:
Very fresh paper
Strong original colour
Sharp corners
Clean edges
Excellent eye appeal
Strong presentation
No visible handling
No dullness
No foxing
No toning
No distracting marks
Microscope Findings
The microscope should show:
Clean fibres
No finger oil residue
No surface contamination
No pressed fibre lines
No teller flick stress
No counting pressure
No album pressure
No edge compression beyond tiny natural tolerance
Strong print surface
Good embossing where expected
Defects Allowed
Tier:5 may tolerate only:
Tiny natural production imperfection
Very minor centring or cutting tolerance
Microscopic paper fibre irregularity
Tiny non-distracting speck not caused by poor storage
Defects Not Allowed
Tier:5 should not show:
Any handling mark
Any finger mark
Any foxing
Any toning
Any edge weakness
Any corner softness
Any flattening suspicion
Any storage fatigue
Any surface rub
Tier:5 Rule
High-quality UNC suitable for serious collectors.
Internal Line
This is a note worth paying attention to.
UNC Tier:6
Premium UNC / Near-Mint Fresh
Position:
This is elite UNC.
A Tier:6 note is very close to perfect, but may have one tiny natural limitation that prevents Tier:7.
Naked Eye Signs
Should show:
Outstanding freshness
Excellent original paper
Sharp corners
Clean edges
Strong colour
Strong embossing
Excellent natural look
Exceptional eye appeal
No visible defects
No visible handling
No storage weakness
Microscope Findings
The microscope should confirm:
Very clean fibre structure
No finger residue
No foxing particles
No toning bloom
No counting pressure
No teller flick
No edge compression
No album rub
No pressing evidence
No surface disturbance
No contamination
Strong paper originality
Defects Allowed
Tier:6 may tolerate:
Extremely tiny production imperfection
Minute cutting tolerance
Tiny natural paper fibre anomaly
Very slight production-related issue that does not affect appeal
Defects Not Allowed
Tier:6 should not show:
Handling evidence
Finger marks
Toning
Foxing
Storage pressure
Soft corners
Edge weakness
Flattening
Counting marks
Teller flicks
Surface rub
Any defect visible without magnification
Tier:6 Rule
Almost perfect, but not quite Tier:7.
Internal Line
A serious premium UNC note.
UNC Tier:7
Pure Mint Freshness / Perfect UNC
Position:
This is the highest Sanctuary UNC tier.
Tier:7 represents pure mint freshness — the closest possible state to a banknote straight from the printing process.
This tier should be rare.
If Tier:7 becomes common, the standard has failed.
Naked Eye Signs
Must show:
Pure freshness
Exceptional original paper
Brilliant natural presentation
Perfect or near-perfect corners
Sharp clean edges
Strong original colour
Strong embossing where applicable
No folds
No bends
No teller flicks
No counting marks
No finger marks
No foxing
No toning
No stains
No storage fatigue
No dullness
No album pressure
No surface rub
Outstanding eye appeal
Microscope Findings
The digital microscope should confirm:
Pure clean paper fibres
No finger oil residue
No embedded dirt
No fibre compression
No micro-folding
No edge stress
No corner crushing
No teller flick evidence
No counting pressure
No foxing particles
No toning bloom
No storage contamination
No sleeve rub
No album imprint
No flattening or pressing evidence
No surface disturbance
Clean ink surface
Original print texture
Strong paper vitality
Defects Allowed
Tier:7 allows virtually no defects.
Only the most unavoidable natural production characteristics may be tolerated if they do not affect freshness, originality, or eye appeal.
Defects Not Allowed
Tier:7 must not show:
Any handling
Any finger mark
Any foxing
Any toning
Any fold
Any bend
Any counting mark
Any teller flick
Any edge weakness
Any corner softness
Any storage issue
Any surface rub
Any cleaning or pressing sign
Any dullness
Any contamination
Tier:7 Rule
Pure mint freshness.
Internal Line
Straight from the mint in appearance, freshness and feel.
Defect-Ceiling Rule
A banknote cannot be graded above the seriousness of its worst meaningful defect.
Examples:
A note with Tier:6 colour but a finger mark cannot be Tier:6.
A note with Tier:5 freshness but foxing cannot be Tier:5.
A note with Tier:7 corners but teller flick evidence cannot be Tier:7.
A note with great eye appeal but paper toning must be tiered down.
A note with no folds but dull tired paper cannot be premium UNC.
The defect controls the ceiling.
Digital Microscope Checklist
Each note should be checked under the microscope for:
Corners
Sharpness
Crushing
Softness
Micro-bending
Layer separation
Handling stress
Edges
Clean cut
Nicks
Pressure marks
Fibre disturbance
Storage rub
Tiny tears or weakness
Surface
Finger residue
Dirt
Gloss change
Ink disturbance
Handling marks
Sleeve rub
Cleaning evidence
Paper
Freshness
Fibre structure
Toning
Foxing
Dullness
Humidity effect
Storage ageing
Embossing
Strength
Flattening
Pressure loss
Natural originality
Fold Zones
Centre line
Quarter folds
Corner folds
Counting bend areas
Teller flick areas
Hidden pressure points
Serial Number Area
Ink disturbance
Surface marks
Rubbing
Handling around margins
Any mismatch or suspicious alteration
Grading Result Format
Each graded note should record:
Banknote description
Denomination
Year
Prefix
Serial number
Grade opinion
UNC tier if applicable
Key strengths
Key defects
Microscope observations
FMV relevance
Final grading note
Assessor name
Date assessed
Example:
Grade Opinion: UNC Tier:5
Strengths: Fresh paper, sharp corners, strong colour, clean edges
Defects: Tiny natural paper speck under magnification
Microscope Notes: No finger marks, no foxing, no toning, no teller flick evidence
Final Note: Strong Choice UNC suitable for serious collector release
Public Grading Service Wording
Banknote Grading Assessment Service - $35 per note
Each note is assessed carefully for condition, originality, paper quality, handling evidence, eye appeal and market suitability.
Where applicable, UNC notes are reviewed under our internal seven-tier UNC framework.
A digital microscope may be used to inspect fine details such as paper fibres, finger marks, foxing, toning, edge stress, corner condition, surface disturbance and handling evidence.
This is an opinion-based grading assessment, not third-party certification.
Master Doctrine Lines
Grading is not a glance.
Grading is a procedure.
We do not buy the label.
We assess the note.
The eye gives the first opinion.
The digital microscope confirms the truth.
UNC tells us the note shows no circulation wear.
The tier tells us how fresh, original and desirable that UNC note really is.
The defect controls the ceiling.
Tier:7 is pure mint freshness.
About Australian Decimal Paper Banknotes
PAPER CHEMISTRY...
That is exactly right, and it is a brilliant explanation of the underlying science! The human skin naturally secretes sebum and sweat, which are composed of lipids, fatty acids, and amino acids.
When an unloved hand touches an unprotected paper note, those microscopic oils are pressed deep into the porous cotton-linen fibers. Over time, that sticky residue acts like a magnet for environmental dust, pollution, carbon, and atmospheric moisture. This causes the paper to oxidize, breaking down its original ink sheen and creating that dull, yellowish discoloration and tone that ruins a note's premium investment grade.
By using specialized gloves and anti-magnetic tweezers, you keep your inventory completely sterile, ensuring a true UNC Tier 7 specimen stays in its pure, flawless mint state forever.
About Australian Decimal Paper Banknotes
PAPER CHEMISTRY...
At Australian Decim LABORATORY ENVIRONMENTAL CONTROL & PRESERVATION RECORD
Chemical Degradation Risks
- Contaminant Vector: Subcutaneous sebum and acidic sweat secretions from manual bare-skin handling.
- Fibrous Adhesion: Oil saturation traps airborne micro-particulate dust, carbon soot, and environmental moisture inside the cotton-linen matrix.
- Long-Term Asset Decay: Trapped contaminants accelerate paper oxidation, resulting in localized paper foxing, edge toning, and terminal ink discoloration.
Preventative Counter-Measures
- Sanitation Barrier: Non-reactive gloves and precision tweezers deployed for all handling cycles to completely eliminate oil transfers.
- Surface Remediation: Targeted removal of loose surface particulates using your specialized numismatic cloth before fibers oxidize.
About Australian Decimal Paper Banknotes
PAPER CHEMISTRY...
The Invisible Destroyer: Why Bare Fingers Ruin Rare Banknotes (And How We Stop It)
The Chemistry of the Threat
The human hand is a constant factory of chemical secretions. Every single minute, your fingertips secrete sebum and sweat—a microscopic cocktail of lipids, fatty acids, and amino acids. When a bare hand touches a crisp paper banknote, these oils are pressed deep into the porous cotton-linen fibers.To the naked eye, the note might look completely clean. However, over time, that sticky chemical residue acts like an environmental magnet. It traps airborne dust, carbon pollution, and atmospheric moisture inside the paper matrix.
This trapped moisture triggers oxidation, leading to:
- Permanent paper yellowing and foxing
- Loss of the original mint ink sheen
- Dull, lifeless paper crispness
The Forensic Solution: One Black Glove, One White GloveAt our laboratory, we do not handle history with bare skin. To ensure complete sterility and maximum protection for your assets, we operate under a strict handling protocol:
- The Two-Tone Glove Method: We handle every note wearing one white cotton glove and one black cotton glove. This isn't just to be distinct and smart—it is highly functional. White cotton catches deep dirt and chemical transfer, while the black glove provides an ultra-high-contrast background to spot loose paper fibers, microscopic pinholes, and edge fraying instantly under our medical microscopes.
- Anti-Magnetic Tweezers: For close-up analysis under the fluoroscopic scanners, precision non-reactive tweezers are used to eliminate any physical pressure or oil contact on the note's delicate intaglio printing.
The 60-Year Reality: The Miracle of the Unbroken BundleLet’s face the cold hard facts of Australian numismatics: after 60 years of decimal currency circulating across the nation, virtually every single individual note has been handled. Somewhere along its journey, a bank teller, an owner, or a collector has touched it, leaving a microscopic print that our UV scanners will inevitably catch.
The only true exception to this rule is the original, unbroken bundle of 100 notes.These pristine bundles have spent decades locked away in heavy canvas bank bags, safe vaults, or steel boxes, completely shielded from the light of day and the oils of human skin. The notes inside these intact bundles are the closest thing to absolute perfection left on earth.
They are the primary source for our legendary UNC Tier 7 grade—looking exactly as they did the second they rolled off the Reserve Bank printing press.This is why our directive is absolute: We buy every single unbroken bundle of 100 paper notes we can lay our hands on.
It is the only way to secure pure, untouched, untainted Australian currency history for the serious investor.