To grade an oil stain on used clothing, press a white blotter on it, then check it under raking light. Oil that lifts onto the blotter and leaves no ring is usually removable and cosmetic. A dark shadow that stays in the fibers after one wash caps the garment at Good or lower.
You list a navy knit as Excellent. The buyer opens it, finds a faint grey halo near the hem, and files a not-as-described claim. You never saw it because you photographed under flat light. Stains are the defect that most often turns a confident grade into a return, and the three most common types behave differently. This guide gives you a repeatable way to type each one before you set the tier.
Why stain type matters more than stain size
A small stain can cost more than a large one. What counts is whether it is sitting on the surface or has bonded with the fiber. Under our five factors, a stain mostly hits Cosmetic Appearance and Odor & Cleanliness. A stain that has weakened or discolored the cloth also hits Fabric Condition.
- Oil and grease: sit in the fiber and darken it. They often respond to treatment if they are fresh, and they often come back after drying if they are old.
- Ink: a dye or pigment that wicks outward. Ballpoint behaves differently from gel or felt-tip, and some of it is permanent on certain fibers.
- Dye transfer: color from another garment, often a red or dark item in a wash. It bonds to the fiber and usually will not lift, especially on cotton and blends.
We treat any stain you cannot remove as a permanent defect, however small. A stain you can remove, and have confirmed is gone after drying, is not a defect. Removing it is just prep work.
The blotter and light test, step by step
Run this sequence on every stained item before you set the tier. It takes about five minutes per garment and needs a white cotton cloth or a plain white paper towel, a bright lamp, and a phone camera.
- Dry-inspect first. Look at the stain under raking light held at a low angle. Note the shape, edge, and color. Oil leaves a dark, soft-edged patch. Ink leaves a sharp or feathered line. Dye transfer leaves a color cast across a panel or seam.
- Test fabric fiber and care label. Read the label before you apply anything. Wool, silk, leather trim, and rayon can be damaged by water and solvents.
- Blot with a dry white cloth. Press, do not rub. If a fresh oil stain transfers a grey mark to the cloth, it is sitting near the surface.
- Apply a small amount of the right treatment to a hidden spot first. Use a mild dish detergent on oil, rubbing alcohol on ballpoint or felt-tip ink, and an oxygen-based color remover on dye transfer if the fabric allows it. Check for color loss before going further.
- Treat, wash, and air-dry completely. Do not machine-dry the garment until the stain is gone. Heat sets residue.
- Re-test under light once fully dry. Oil often reappears as a ghost ring when it dries. Look from both sides of the fabric at a low angle. If the shadow is gone, the stain is removed. If it remains, grade it as permanent.
If you are not certain the stain is gone, assume it is not. A stain that returns on the buyer's table costs more than the tier drop would have.
How to grade oil stains on used clothing
Oil is the most variable stain, which is why it needs the most care. A fresh salad dressing drop on a cotton tee often washes out. A cooking oil stain that has aged through several washes and dryers has oxidized and will not.
Signs the oil stain is removable
The stain lifts onto the blotter, fades after dish detergent treatment, and shows no ring after drying. The fabric hand is unchanged. Grade it as if the stain was never there, and be sure the garment smells clean.
Signs the oil stain is permanent
A dark patch remains, a ring returns on drying, or the fabric feels stiff or slightly tacky. On silk and rayon, oil often leaves a mark even after professional cleaning. On a small, faint stain in a low-visibility spot, the grade sits at Good. On a visible chest or sleeve stain, the garment is Fair, and if the fabric itself is compromised it moves toward Poor.
Also check Odor & Cleanliness. Old oil can go rancid and leave a smell that survives washing, and that alone can pull a garment down a tier.
Ink stains: ballpoint, gel, and felt-tip behave differently
Ink is more predictable than oil once you know its type. Ballpoint ink is oil-based and often responds to rubbing alcohol on cotton and polyester. Gel and felt-tip inks often contain pigments or dyes that bleed outward and set. Pen marks on white or light fabric are the most visible, and the ones buyers photograph first.
- Lifts with alcohol and leaves no halo: removable. Wash and confirm. Grade without penalty.
- Fades but leaves a faint line: permanent, minor. Grade at Good if the mark is small and in a low-visibility area.
- Spreads when treated: stop. The ink is migrating, and more treatment may widen the damage. Grade at the current state, usually Fair if visible.
A stain on a pocket interior or hidden seam allowance is a different case from one on a front panel. Say where it is and photograph it.
Dye transfer: usually permanent, and often misread
Dye transfer happens when a loose dye from one garment bonds to another in a wash. It tends to appear as a pink cast on whites or a grey haze on light colors. It differs from a stain because there is no dirty spot to lift. The fiber itself has taken on color.
Try an oxygen-based color remover only if the fabric allows it, and test on a hidden area. Some light transfer on cotton does lift in one or two soaks. Heavy transfer, or transfer on blends and delicate fibers, usually does not. If it fades only partly, grade the remaining cast as a permanent defect.
Do not confuse transfer with fading. A faded garment lost its color evenly. A transferred one gained an off color, often in streaks. Buyers can see the difference immediately in daylight.
Stain type and tier: a comparison table
| Stain state | Typical response | Factor affected | Likely tier effect |
|---|---|---|---|
| Oil, fully removed, no ring after drying | Lifts with detergent | None after cleaning | No drop |
| Oil, faint ghost ring, low-visibility spot | Reduces, does not clear | Cosmetic Appearance | Good |
| Oil, visible and set | No change | Cosmetic Appearance, Odor & Cleanliness | Fair |
| Ink, lifted fully | Alcohol removes | None after cleaning | No drop |
| Ink, faint line remains | Partial fade | Cosmetic Appearance | Good |
| Dye transfer, partial | Color remains on fiber | Cosmetic Appearance, Fabric Condition | Fair |
| Any stain with fiber damage or lasting odor | Weakened cloth | Fabric Condition, Odor & Cleanliness | Poor |
These placements are guidelines. Placement, garment color, and category all shift the call. A faint ghost ring on a black hoodie is a smaller problem than the same ring on a white dress shirt.
What to write in the listing
Disclosure protects you better than a good grade does. Buyers who see a stain named, located, and photographed rarely dispute it. Buyers who find one you did not mention often do.
- Name the type if you know it: "faint oil mark, front hem, 1 cm."
- State whether you treated it and what remains.
- Photograph the stain close up in raking light and again at normal distance for scale.
- Match the tier to the permanent state, not the hopeful one.
Do not list a stain as removable unless it has been removed. If the buyer can fix it, they will tell you the garment was cleaner than you said. If they cannot, you carry the return.
Grade one stained garment and see the report
Pick the garment in your pile with a stain you have been unsure about. Run the blotter and light test, then grade it in GradeThread to see how the stain lands across Cosmetic Appearance, Fabric Condition, and Odor & Cleanliness. You get a numerical grade, a condition report, and a certificate you can attach to the listing.