Dry Powdered Tannin Tannic Acid Product Information Bulletin Tannic Acid, a commercial form of tannin is not a true acid but an acid-like substance called a polyphenol.  It occurs naturally in tea, coffee, oak, sumac bark and myrobalan.   Tannic Acid is a basic ingredient in the chemical staining of wood. The tannic acid or tannin is already present in woods like oak, walnut, and mahogany.   Tannic acid can be applied to woods low in tannin so chemical stains that require tannin content will react.   Tannin – Other Uses: Tannic acid is the most common mordant for cellulose fibers such as cotton. Tannin is often combined with alum and/or iron. The tannin mordant should be done first as metal mordants combine well with the fiber-tannin complex. Directions: To make a solution to treat woods lacking tannin content:   1. -- Mix (in Plastic or Glass container) five (5) parts, tannic acid powder into 95 parts of warm water - or, (3 Teaspoons into 8 ounces of warm water). Tannin may also be dissolved in denatured alcohol or acetone.   2. -- Apply the tannic acid solution to the wood. Wear Eye, Skin & Respiratory Protection. Use With Plenty of Ventilation.   3. -- Allow the treated work to dry completely before applying any other chemicals.   Notes: Always make tests to evaluate your process on the particular wood in use. Best results will be obtained on new or previously unfinished woods.   Potassium Dichromate and Ammonia react with tannin to yield rich wood tones. "Rust Water"(steel wool saoked in vinegar) applied to a tannin treated wood will yield rich Black tones.   WARNING KEEP AWAY FROM CHILDREN Tannic acid is toxic when eaten or inhaled. Wear Eye, Skin & Respiratory Protection Wash Hands Thoroughly After Us DO NOT INHALE USE WITH PLENTY of VENTILATION Back To: Tannin Price List Available from: Shellac.net Wood Finish Supply