Response to Good results with Technical pan

Hi I Its not the first time I hear bout the Photographers Formulary, could someone tell me what the HxLL is it? Is it a book with recepies, a shop where to get chemicals? what?

If some one knows anything on how it reacts with rodinal, In the massive dev chart I saw that you can use it with 1+99, 1+150 and 1+300 ratios, for continuose tone. any experience with it?

DIego K.

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