Hi, Since Jim has suckered me into this snake oil called Dixactol, the stuff appears to require the use of a non acidic fixer (this is how snake oil salesmen work.. there's always another product that needs to be bought :-) ;-) ) I checked the web and the shipping costs for TF-4 is insane. It's more then the actual product. So I am gonna mix this stuff myself.. My cookbook lists TF-2 and TF-3. Other then what the book states, what are the major differences between these two and TF-4? And, can one just order Ammonium Thiosulfite or is it commonly mixed from two other chemicals ? Thanks J -- Justin F. Knotzke jknotzke@xxxxxxxxxx http://www.shampoo.ca