We might learn something about Gum printing.

''The one( PVA ) I have here seems to work well enough.''

Hi, We cannot see why TK is asking this question if he is quite happy with the PVA he is using to make gum prints. Perhaps he might tell us.......
                 John Grocott - Photographist. London.
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In a message dated 3/4/06 6:35:32 am, rs@silvergrain.org writes:

Furthermore, the alcohol groups in PVA is _secondary_ alcohol and so
they undergo usual alcohol reaction, such as oxidation. So alcohols
can be oxidized to _ketone_. Commercial PVA is likely to have
residual acetates and a small fraction of ketones made by oxidation.
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TK asks:-
''Does this have any effect on the suitability of 'commercial' PVAs for the purpose of gum printing ?

The one I have here seems to work well enough.

Terry ''
Received on Mon Apr 3 02:19:28 2006