I have not observed any yellowing at all of the papers that I have
sized with albumen. Perhaps it is a paper issue and not the albumen
itself?
In any event, the mechanism for yellowing of albumen prints is pretty
well understood to be primarily due to the formation of silver
sulphide from silver albumenate.
Sandy King
>In a message dated 21/07/2006 18:10:49 GMT Daylight Time,
>sanking@clemson.edu writes:
>
>>
>>
>>Yellowing of albumen prints is not due to the albumen itself but to
>>silver that remains in the print in combination with the albumen,
>>silver albumenate. This can not be removed by hypo, and the
>>yellowing of the highlights occurs as the albumenate breaks down
>>and releases the silver, which then reacts with sulphur compounds
>>in albumen to produce brown silver sulphide. The yellow fading can
>>not be reversed.
>>
>>
>>I would not expect that a Pt./Pd. print on paper sized with albumen
>>would yellow. I have made a few carbon prints using paper sized
>>with albumen rather than gelatin but there is not enough difference
>>in look, at least in my eyes, to justify the additional expense and
>>trouble. If you choose to try albumen sizing for Pt./Pd. printing
>>you might look into the liquid albumen sold in grocery stores.
>>
>
>
>Sandy
>
>That may be the received understanding but, as you would not have
>expected, albumenised papers yellow when silver has not been
>anywhere near them.
>
>If you buy albumen from grocery stores, it is a popular ingredient
>of icing for cakes, it still has to be processed as you would raw
>white of egg, before you use it.
>
>Albumen also makes glorious gum prints.
>
>
>Terry King
>The nice one)
Received on 07/21/06-01:54:38 PM Z
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