Sorry for the late reply. Holy cow this thing got expensive! https://www.amazon.com/Photographers-Toning-Book-Definitive-Guide/dp/0817454659 https://www.amazon.

Sorry for the late reply. Holy cow this thing got expensive! https://www.amazon.com/Photographers-Toning-Book-Definitive-Guide/dp/0817454659 https://www.amazon.com/Photographers-Toning-Book-Definitive-... It is the most comprehensive guide to toners I have ever seen. Glad I kept a copy of it!