GENERAL FORMULA No. 209 is an acidified product for the removal or reduction of tannin and caramelized sugar stains. It is also effective in the removal of writing inks and the last traces of a lipstick stain. GENERAL FORMULA No. 209 is a next-level tannin stain remover that can be used safely and effectively by experienced, professional spotters. Being acid in nature, GENERAL FORMULA No. 209 is more active on dyestuff and colors when mixed with water or heated, either with the steam gun or hot metal spotting board. Special care should be taken when used on a dyestuff that you expect might be fugitive or of the type that is affected by any acidified compound. Use an unexposed seam on the inside of the garment to make a quick check.