While reading another topic and following some posted old reference links I came across the use of zinc metal, when inserted into a batch of too old, too red collodion to decolorize it.
This was found in "Notes and Queries", the "Restoration of old Collodion". This note provided by a Mr. Hautes Pyrenes Luz, which appears to be more likely a nom de plume.
It is a direct reactio
Forum: General Discussion