Japanese animation production artwork — hand-painted cels, pencil genga and douga, and gouache backgrounds — represents one of the most collected categories of animation art worldwide. The Japanese animation industry produced hand-painted cels from the 1960s through the early 2000s, when studios transitioned to digital production. Unlike Western animation, where major studios often destroyed production materials, Japanese studios and their employees frequently preserved and sold production artwork through specialized dealers, creating a deep collector market.
Rinkya has developed a condition grading standard specific to animation production art, informed by conservation science and established market practice. Our grades assess what matters most to collectors: the visual condition of the piece as it appears for display. Structural and conservation factors are documented separately as condition flags, giving a complete picture of both how a piece looks and what issues are present. This standard covers Japanese animation production art specifically, using terminology and references familiar to collectors of anime production materials.
How Grading Works
Every Rinkya-certified animation cel receives two components:
A grade (S through F)
Reflects the visual and display condition of the piece. What does it look like? How does it present?
Condition flags
Documents specific structural, conservation, or material issues observed. These are disclosures, not grade deductions.
A piece can receive a high visual grade while also carrying condition flags. A cel with vivid colors, crisp lines, and intact paint may have layers adhered to the background. That cel is graded on what you can see, with "Stuck to background" noted separately. Attempting separation is not recommended without professional conservation guidance, but the visual condition of the piece stands on its own merits.
This approach gives collectors accurate information without unfairly penalizing visually outstanding pieces for structural issues that may be stable and inconsequential for display.
Grade Scale
Rinkya uses a six-point letter scale. Points start at 100 and deductions are applied per condition category. Grades are assigned based on the resulting score.
Pristine (95–100)
Colors are vivid and fully saturated. Lines are crisp with no fading. Paint is intact with no chipping, cracking, or loss. No acetate browning visible. No surface haze, bloom, or deposits. No structural issues of any kind. Grades of S are rare for cels produced before the 1990s and represent exceptional preservation for the age of the material.
Excellent (80–94)
Colors remain strong and fully display-ready. Lines are well-defined with only the most minimal fading, if any. Paint is intact with no chipping or loss. Minimal acetate browning consistent with the piece's age — this is a natural, expected characteristic that does not indicate active deterioration. Fully appropriate for prominent display. Any structural issues are documented in condition flags and do not affect the visual presentation.
Very Good (60–79)
Light line fading is visible on close inspection; colors may show slight softening but remain clearly legible and presentable. Minor condition factors may be present but do not substantially affect the displayed appearance. No paint loss. A well-preserved piece showing normal signs of age. Appropriate for display.
Good (40–59)
Noticeable line fading is visible at normal viewing distance, or minor paint chipping is present in limited areas, or paint cracking (crazing) is present. Colors may be softened but the image remains clear and identifiable. The piece is displayable but shows visible signs of age and condition issues. Specific issues are documented in condition flags.
Fair (20–39)
Significant paint loss, heavy fading, substantial cracking, or notable structural or material issues are present. The piece may retain reference or archival value and may be displayable in certain contexts, but conservation attention is recommended. Condition flags document the specific issues observed.
Poor (0–19)
Major paint loss affecting significant portions of the image, active vinegar syndrome, structural failure, or severe deterioration. Active vinegar syndrome is a treatable condition; specialist conservation treatment is available through accredited film and paper conservation laboratories. Grades of F indicate a piece requiring professional conservation assessment.
Condition Flags
Condition flags are documented alongside the grade and represent specific observable characteristics. They are not grade deductions. A flag means the condition was observed and is disclosed so collectors have complete information.
Line Fading (Light / Moderate / Severe)
The lines on animation cels were applied with ink or pigment on the reverse side of the acetate. Over time, these lines can fade through light exposure, chemical changes in the paint, or natural aging of the acetate substrate. Light fading may only be visible under direct examination; severe fading reduces image clarity and legibility.
Paint Chipping / Paint Loss
The vinyl paint used on production cels can chip or flake over time, particularly at edges, corners, and areas of fine detail. Once paint is lost it cannot be fully restored. This flag notes the presence of any paint loss, however minor.
Paint Cracking (Crazing)
A network of fine cracks across a painted area, caused by the differential aging rates of the paint layer and acetate substrate. The paint remains in place but is fractured. Most visible in areas of thick, solid color. Crazing does not always progress, but indicates the paint bond is under stress and may eventually lead to paint loss if unstabilized.
Bloom
A hazy, oily, or in some cases crystalline deposit on the surface of the cel, caused by plasticizer migrating out of the acetate over time. Bloom can sometimes be stabilized but is difficult to fully reverse. It is distinct from surface haze and from acetate browning.
Acetate Browning (Light / Moderate / Heavy)
The cellulose acetate base of production cels naturally browns over time through oxidation. Light browning is a normal, expected characteristic of any cel produced before the mid-1990s and does not indicate active deterioration. Heavy browning reduces contrast and can affect legibility of detail in shadow areas.
Stuck to Background
The cel has become adhered to its original background and cannot be separated without risk of damage. This is a stable condition in many cases — the piece can be displayed and photographed as a unit. Attempting separation is not recommended without professional conservation guidance.
Stuck to Overlay Cel
One or more overlay cel layers have adhered to the main cel through plasticizer migration or prolonged storage in contact. Similar handling cautions apply as with background adhesion.
Stuck to Douga / Sketch
The cel has adhered to its underlying pencil sketch (douga). Separation attempts risk damaging both layers.
Surface Haze
A milky or cloudy appearance on the surface of the acetate, distinct from bloom. May be caused by surface degradation, humidity exposure, or prior cleaning with inappropriate materials.
Water Damage / Tide Marks
Visible evidence of past moisture exposure. Water damage may cause tide marks (ring-shaped deposits), paint lifting, or acetate wrinkling.
Adhesive / Tape Residue
Residue from tape, labels, or adhesives previously applied to the cel or its storage materials.
Acetate Scratches
Surface scratches on the acetate layer. Fine scratches may be barely visible; deep scratches affect the display of the piece.
Warping / Waviness
The acetate has deformed from its original flat plane. Light waviness is common in older cels; significant warping can make framing and display challenging and may indicate advancing deterioration of the acetate base.
Vinegar Syndrome (Inactive / Active)
The chemical breakdown of cellulose acetate, producing acetic acid as a byproduct. Inactive: the characteristic vinegar odor is faint or absent with no active warping. Active: a strong vinegar odor is detectable and the acetate may be deforming. Active vinegar syndrome is treatable; specialist conservation treatment is available through accredited film and paper conservation laboratories. Affected pieces should be stored in appropriate archival conditions pending treatment.
Prior Restoration
The piece shows evidence of prior conservation or restoration work. This may include paint infill, consolidation of flaking areas, or surface treatment. Restoration work is disclosed; the extent and quality of prior work is assessed and documented where possible.
Lamination Failure
Where a cel has been laminated (encapsulated between protective layers), the lamination has begun to delaminate, cloud, or otherwise fail.
Market Context
The Japanese animation art market is the largest in the world by volume. Mandarake, Japan's premier vintage animation goods retailer, grades items S through D across all product categories. Yahoo Japan Auctions handles significant volume of animation art. These grades are applied consistently but are not calibrated to the specific condition factors of animation production art.
Western auction houses including Heritage Auctions and Van Eaton Galleries provide descriptive condition reports for Japanese animation art, but apply no standardized scale.
No third-party grading service dedicated to animation production art currently exists. Rinkya's grading standard was developed to fill that gap, drawing on conservation science specific to cellulose acetate materials and established market practice.
Our Grading Process
Each Rinkya-certified record is assessed by a named specialist whose credentials are documented on the record. The grading framework was developed collaboratively by Rinkya and its authentication specialists, drawing on conservation literature on cellulose acetate materials and established market practice.
Our specialists apply a standardized internal assessment protocol that ensures grades are consistent across certifiers and over time. The internal methodology is proprietary. What we publish — the grade, the grade scale, and the condition flags — represents our complete public disclosure for each certified piece.
References
The following sources informed the development of this grading standard:
- Getty Conservation Institute. Research on cellulose acetate degradation and preservation of animation cels, conducted in collaboration with the Walt Disney Animation Research Library. The definitive scientific resource for animation art conservation. getty.edu
- Image Permanence Institute, Rochester Institute of Technology. Research and technical publications on cellulose acetate film degradation and the preservation of acetate-based materials. imagepermanenceinstitute.org
- Western Association for Art Conservation (WAAC). "An Introduction to the Forms and Materials Used in Animation Art." Defines animation art forms, materials, and conservation terminology. cool.culturalheritage.org
- American Institute for Conservation (AIC). "Animation Cels: Conservation and Storage Issues." Technical paper on cel degradation, storage conditions, and treatment approaches. resources.culturalheritage.org
- Northeast Document Conservation Center (NEDCC). Preservation leaflets on the care and handling of cellulose acetate and paper-based materials. nedcc.org