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Stains on pelts
- Black Stains
- Iron stains, chiefly caused during transferring (iron rails, drip water), appearing after sulfide liming (iron sulfide)
- Sodium sulfide containing water
- Blue and Red Stains
- Damages caused in curing, salt stains, germ caused by microorganisms
Stains on leather
- Brown Stains
- Sludgy extracts
- Flocculations in the suspenders, which deposit in the grain
- Air stains
- Contact Stains (Suspender liquors)
- Tannin migrated to the surface
- Tannins stains before coloring
- Burnt areas, caused, e.g., by scorching
- Black Stains
- Iron stains caused in splitting or shaving or by drip water etc.
- Greenish Stains
- Copper stains caused by pipes or fittings
- Sumac stains (chlorophyll)
- Grey-Brown Stains
- Lime stains (lime blasts) caused by exposure to air, use of hard water for washing and rinsing, lime liquor prepared with fresh water
- Dark Stains, (especially in the flanks and shaved areas)
- Scud not properly removed
- Pale Stains, round
- Stains caused by pools of tan or bleach liquors
- Pale Stains, oblong
- Abrasions, especially those caused by drumming
- Pale Pinholes (pits)
- Damages caused by curing: pits caused by overbating
- Pale Spots
- Bleaching materials not completely dissolved before addition
- Greyish Leather Shade
- Tan liquors containing iron; concrete pits, fittings, suspension frames
- Iron content of plant water too high, possibly caused only by rusty pipe line or condensing water containing grease
- White spue (removable with water)
- Salt spue, (sodium sulfate, magnesium sulfate, common salt) due to sole leather seasons or to old, worked down liquors; insufficient steeping or rinsing
- White spue (not removable with water)
- Fatty spue, usually consisting of free fatty acids, but with solvents; melts in the heat; and sometimes of higher fatty alcohols
- Leathers match test failures
- Fat liquored too acid or unsuitable fat liquoring agents were used. May also be caused by fat splitting microorganisms
- Uneven penetration, (untanned middle)
- Too intensive coloring (case-hardening)
- Sludge layer in the pores
- Excessively exhausted liquors
- Poor and loose flanks
- Poor raw material
- Lime too old
- Bating bath too strong or too warm
- Excessive straining
Grain faults
- Loose Grain
- Poorly cured raw material
- Excessively stressed by prolonged soaking, liming or bating
- rummed too long in short liquors
- Overstrained by swelling
- High Grain
- Excessive initial swelling in the lime
- Coloring liquor too acid
- Cracked Grain
- Careless handling of the raw hides
- Careless handling of excessively swollen pelts
- Excessive pressure of sammying and setting out machines etc.
- Pebbled Grain
- Prolonged drumming
- Liquor too short
- Rate of revolution too high
- Drawn Grain
- Coloring in liquors that are too fresh, too acid, too strong or too warm.
- Liquor too short
- Rate of revolution too high.
- With combination- tanned leathers, tanning liquors too strongly absorbed
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