配方类型：	TEXTILES AND THEIR TREATMENT
配方说明：	Iron Stain Removal
配方组成：
配制方法：	Souring only to pH 5.0 is usually without effect in removing iron stains. After souring to pH 5.0, it is necessary to add dilute stock solution equivalent to about 1/2 pound of Ammonium bifluoride for each 100 pounds of cloth. It is usually advisable to carry out stain removal at 140-180F. The excess Ammonium bifluoride solution should be rinsed out at least to a pH of 5.0. If the soluble, colorless iron salts are allowed to remain in the cloth, the iron stains will show up again the next time the cloth delay is desired.

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