True, areas initially clear will slowly brown.
I've tested Ilford's version of the HT-2 against
Kodak's version. The results, Ilford's spot tests
are sooner to brown and as time goes by they
turn a darker brown than those of Kodak's.
Ilford's is without the acidic acid; no more
than a 1% solution of silver nitrate. Dan
Dancqu, can you say more about the Ilford test? Is it a published formula like Kodak's HT-2 or is it a packaged product? If it is a formula, could you post the formula here?