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Here are two links to posts dealing with how to post pictures on Black River Fossils forums.
1. How to Post Pictures on Black River Fossils Forums by ditchweezil
2. How to Post Pictures on Black River Fossils Forums by Daryl
Like a buffoon I have stumbled upon something that really works for removing the black tannic acid deposits from river teeth. For the heck of it I put toothpaste on an old sock, then rubbed the tooth between my fingers with the sock and toothpaste. The black stains just melted away! I couldn't believe it. It worked better than any technique I've ever used in the past. Anybody else ever try that with success?
I tried it with some of my teeth, but it didn't seem to work as well.
I'll try it again and let you know.
When I went to Dorchester creek the teeth that I found had this thick black/greenish gunk on them. Im not sure if it was tannic acid deposits, but the sand technique that Big Red Meg mentioned in another post, with the addition of some dish soap, did what I thought was an amazing job on all the teeth.