Tetrapyridino-Ferrous Chloride Yellow Salt

Submitted by Oskar Baudisch and Walter H. HARTDNGt Checked by W. O. Milligan t 

An intense yellow color appears as soon as the first drops of the solution are added. Soon a yellow crystalline solid separates. When the action is complete, the mixture is allowed to stand for at least 12 hours under an atmosphere 

The product is a yellow crystalline substance which is stable if kept in sealed containers. On continued exposure to air, the characteristic yellow color becomes a pale yellow or even white. 

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