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. Tannin occurs naturally in tea, coffee, oak, sumac bark and myrobalan.

Tannic acid can be utilized as a basic component in the chemical staining of wood. Tannin is already present in woods like Cherry, Oak, Walnut, and Mahogany.

Tannic acid solutions can be applied to woods low in tannin content so stain chemicals (such as Potassium Dichromate) that require tannin to react will produce the desired effect.

Tannin, other uses: Tannin is used in the tanning of leather and tannic acid is the most common mordant for cellulose fibers such as paper and 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, tannin powder into 95 parts of warm/hot water • or, (3 Teaspoons into 8 ounces of warm/hot water). Tannin may also be dissolved in denatured alcohol or acetone.

2. -- Apply the tannin solution to the wood by brush sponge or rag. Wear Eye, Skin & Respiratory Protection. Use with Plenty of Ventilation.

3. -- Allow the treated work to dry completely (usually overnight or 8 hours) before applying Potassium Dichromate or any other chemicals.

Notes: • Always make a test to evaluate the process and liquid concentrations on the particular wood in use.

• Best results will be obtained on new or previously unfinished (grease & oil free) wood.

• Potassium Dichromate and Ammonia react with tannin to yield rich wood tones. "Rust Water" (steel wool soaked 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 Use

DO NOT INHALE USE WITH PLENTY of VENTILATION

Available from: Shellac.net Wood Finish Supply