Originally Posted by mc
Does anyone use cobalt dryer we used it in oil base printing ink it does smell like Japan dryer and it produced a hard shine finish

Actually, almost all of what we call Japan Dryer is made with cobalt compounds. Most chemical driers are composed of some heavy metal salt or compound, with a thinner like naphtha. Some of these heavy metal compounds are toxic too.

The Japan Dryer you buy is about 97% thinner. In spite of being that diluted, it is still very potent stuff, and a little goes a long way. As I said earlier, using too much is not a good thing. Here's a table that shows the characteristics of various chemical driers:

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