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nature : leather, raw hide acid or alkali encountered the phenomenon occurred. As with caustic soda, sodium sulfide or alkaline substances such as lime solution for handling raw skin, and skin absorption of alkaline hydroxide ions, Paper ion concentration within the skin than the ion concentration, osmotic pressure difference caused prompted a lot of water penetration skin, so the skin thickness rapidly thickening, saying inflation or alkali treatment. Contrary as salt water or acid and expansion can eliminate the phenomenon, known as Consumers Expansion (falling), or from China and alkali. General tanning process must go through expansion or swelling after Xiaozhang, tanned facilitate the infiltration and integration, and to increase the degree of soft leather.
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