Tannic Acid, Reagent ACS Powder, High Purity, 95% min., 100 Grams

Excellent quality, I used this to create a rust conversion solution, a little pricey for the quantity and shipping was a little long, but worked well to convert rust, I will be looking for a less expensive alternative, I will follow up on my experiences later

Works well for making my own rust converter mix. Just add distilled water and some naval jelly

Used for a science experiment and it did the job.

Used for protecting rusting metal tools.

Using to tone my cyanotypes. Two thumbs up. Got sick of fumbling with tea and coffee so decided to try tannic acid powder. Never going back. Tip I’ve found: Bleach cyanotype first with soda ash and remember the toner dries darker. It tones fast so keep an eye on it.

I bought this product to add to an in-grown toe-nail product called Outgro, which used to work until the FDA forced them to take out the Tannic Acid. I put this product into a bottle of Outgro I had bought, and now it works just like it used to. Also, this was the fastest delivery I have ever gotten from a seller on Amazon! I was very pleased because I really needed this product, and I didn't have to pay for expedited shipping.

Worked well for aging wood

No problem with the product. My entire problem is with the price. I found an Amish website that claimed this product would convert rust with a $3 bag of powder. They showed a bag about the size of 5 lbs of sugar. This package was 100 grams (about 3.5 ounces) and cost $25. There is no excuse for that price except greed. Tannic acid powder is made from the bark or leaves of oak trees and should cost almost nothing.