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The contents of the Gum bichromate page were merged into Gum printing on 20 December 2023. For the contribution history and old versions of the redirected page, please see its history; for the discussion at that location, see its talk page. |
Velella Velella Talk 14:10, 4 May 2023 (UTC)
How about merging this article with Gum bichromate plus a redirect from "gumprint"? --Einemnet 07:43, 5 November 2007 (UTC)
Two main issues. Firstly the Gum bichronate process and Gum printing are different in that in the first, coloured material is included in the gelatine bichromate mix so that after exposure and "development" a single coloured print is obtained. In gum printing however the process makes a negative in relief which is then used to make multiple copies using a printing method similar to lithography - unfortunately the text of the Gum printing article confuses the two processes making them sound as if they are the same. I will try and edit a little more clarity into the article. Velela 22:57, 5 November 2007 (UTC)
A further issue is that much of the text of the Gum bichromate article really belongs in Wikibooks and not here - all the recipe and methods stuff for example. Velela 23:03, 5 November 2007 (UTC)
Ammonium Dichromate saturates in distilled water at around 25-29%, not the 15% quoted here. I then mixed the sensitizer 1:3 with gum acacia. My contrasts turned out fine, though I am still working out some issues with yellow staining. What I'm trying to say is that some citations here would be appreciated. **Gum Bichromate processTerryToogood (talk) 19:48, 4 May 2015 (UTC)
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