[Raphael]

Hi all,

I revive this old thread because I am back to FB printing, and tried to use again an HT-2 test bottle I made two years ago. From memory, I followed the Unblinkingeye website formula.

Of course, this HT-2 tester was stored in a full, well stopped, brown glass bottle, in obscurity, but I was concerned by the shelf life of this product.
I found this thread here, and I agreed the better way is to test it, with a very quickly washed FB test print.

Reading, in the excellent "Way Beyond Monochrome" book, that the test should be made in subdued light, I interpreted it (maybe mistakenly), that it can be conducted in red, safe darkroom light...

So I was a little puzzled, when, for the five spot of HT2 tester I placed on the quickly washed sheet (Forte Fortezo Museum paper...), after 5 minutes, absolutely no one let any stains at all !

So, my question : Is "actinic" non-red light is mandatory when HT2 testing ? If yes, how the ambiant available light affect the test result ?

In advance, thanks you,

Best regards,

Raphael