Hi,

For those that want a good book about toning: have a look at Tim Rudman's latest book: The Photographer's Toning Book: The Definitive Guide.

It answers almost any question you can think of in respect to toning. It's a good reference and tutoring book as it covers all toners available, all techniques possible (single, indirect, partially toning, split toning, double toning etc etc).

Huib