Difference between revisions of "Leather defects"
From www.leather-dictionary.com - The Leather Dictionary
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* '''[[Dye transfer from leather]]''' is a result of insufficient color fixation, for example by excessively concentrated dyes or too little washing out after dyeing. If the color concentration is too high, '''[[Bronzing leather|bronzing]]''' can occure. | * '''[[Dye transfer from leather]]''' is a result of insufficient color fixation, for example by excessively concentrated dyes or too little washing out after dyeing. If the color concentration is too high, '''[[Bronzing leather|bronzing]]''' can occure. | ||
| − | * In the [[Liming - Leather Tanning|liming process]], too long remaining in fresh air can cause | + | * In the [[Liming - Leather Tanning|liming process]], too long remaining in fresh air can cause '''liming stains''' on the [[Leather grain - Grain side|grain side]] of the leather. |
| − | * Irregularly blood | + | * Irregularly '''blood stains''' are caused by lack of drainage of the salt liquor after the [[Preservation by drying, salting or freezing|preservation of the hides by salting]]. |
| − | * Colour defects can occur if the applied [[leather colour|colouration]] does not cover uniformly, especially on already damaged areas. | + | * '''Colour defects''' can occur if the applied [[leather colour|colouration]] does not cover uniformly, especially on already damaged areas. |
* '''[[Fatty spue - Fat marks on leather]]''' occurs with leathers containing a high level of fat such als [[sheep leather]]. | * '''[[Fatty spue - Fat marks on leather]]''' occurs with leathers containing a high level of fat such als [[sheep leather]]. | ||
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* '''Tannin stains''' is caused by uneven concentration of the [[Tannins|tanning agent]] in the [[leather production]. | * '''Tannin stains''' is caused by uneven concentration of the [[Tannins|tanning agent]] in the [[leather production]. | ||
| − | + | * [[Looseness]] is caused by missing leather fiber substance under the grain surface. The surface then tends to form small wrinkles. This is a skin defect of the living animal. Such skins should not even find their way into the [[leather production]]. | |
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</p> | </p> | ||
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| − | ''[[ | + | ''[[Bronzing leather]] and [[dye transfer from leather]].''<br></p> |
<p> </p> | <p> </p> | ||
Revision as of 20:43, 21 January 2017
Leather defects are defects in the finished leather, which are caused by damaged raw skin, or have arisen due to wrong storage or are caused by improper processing during the manufacturing process.
- Dye transfer from leather is a result of insufficient color fixation, for example by excessively concentrated dyes or too little washing out after dyeing. If the color concentration is too high, bronzing can occure.
- In the liming process, too long remaining in fresh air can cause liming stains on the grain side of the leather.
- Irregularly blood stains are caused by lack of drainage of the salt liquor after the preservation of the hides by salting.
- Colour defects can occur if the applied colouration does not cover uniformly, especially on already damaged areas.
- Fatty spue - Fat marks on leather occurs with leathers containing a high level of fat such als sheep leather.
- Tannin stains is caused by uneven concentration of the tanning agent in the [[leather production].
- Looseness is caused by missing leather fiber substance under the grain surface. The surface then tends to form small wrinkles. This is a skin defect of the living animal. Such skins should not even find their way into the leather production.
Bronzing leather and dye transfer from leather.
Additional information
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