RE: Tartaric Acid as contrast agent in VDB?

From: guillermo mischkinis ^lt;[email protected]>
Date: 01/07/04-09:29:06 AM Z
Message-id: <01d501c3d576$200101e0$584046c8@guillermo>

Hi, sorry but my english is not so good...

If the sensibility of silver chloride is 100, the silver tartrate is about 17.

The organic salts of silver always have a smaller sensibility that the haloid salts , but at a extended exposure the image acquires good intensity.

Ive tried with no organic acid, mixing only silver nitrate 10% with ammonia ferric citrate 25% , and the exposition times for a more than normal contrasted negative is about 6 minutes, at sun.

guillermo mischkinis
Received on Wed Jan 7 17:44:31 2004

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