Act quickly when an acid has been spilled, for it may damage the cloth
or destroy the color. First, wash the stain with cold water to stop the
action of the acid. Rinse several times in cold water; then apply
ammonia water or baking soda. Water alone will not restore color, but
ammonia water may.
Baking soda.—Sprinkle soda on both sides of the stain, moisten with
water, and allow to stand until the bubbling stops. Rinse well with
water.
Ammonia water.—Hold the dampened stain over an open bottle of strong
ammonia water; or if the material doesn’t water-spot, put a few drops of
ammonia water, diluted to half strength on the stain. Since ammonia
water affects some dyes, have white vinegar ready to apply quickly if
the color changes. Rinse well with water.