UMITAN TAS / VLA POLV. is a combination of vegetable tannins clear and is used in Concie plants and also in the retanning of leathers tanned with chromium salts. Due to its characteristics of astringency and light color, the UMITAN TAS / VLA is used in the production of articles of handbags, tassel, tassel aniline, semichrome and furniture. UMITAN TAS / VLA being a vegetable tannin is very sensitive to iron ions, so you may want to add in the normal production cycle of a sequestering iron.