配方类型：	LEATHER
配方说明：	Syntan (Synthetic Tanning Agent) (French Patent 900,655)
配方组成：	Oxalic Acid/1 Phenol/94 Reflux for 45 minutes while stirring. Heat in vacuum at 75C. Then add slowly Sulfuric Acid H2O/50 30% Formaldehyde/70
配制方法：	at 50 to 60C. and heat in vacuum at 70 to 75C. for 2 hours until completely water soluble. Neutralize with alkali and adjust with an organic acid to a pH of 3 to 4.

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