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re-orotone
Steve Shapiro wrote in a message dated ; Thu, 19 Oct 2000 23:22:39 -0700
>Can you find out what Curtis used for coating his glass for the orotypes?
I have no more information about coating method and materials used by
Curtis, Up to now it was impossible to find a quote in photographic
bibliography. Just assumption I made on the observation of a post Curtis
plate (out of the frame) a friend .
has given to me.
The backing seems very regular, specialy the edges, like machine coated ? The
opacity of gold coat isn't so high but it works very well. Tomorrow I will try
to quantify it with my densitometer.
Question : the gold backing was
1. coated at the manufacturing step of the
plate - the processing solutions go through this coating to silver halides
(it isn't waterproof). The positive image is exposed on the glass side,
unusual...
2. the gold coat exists only after the regular processing. What's the method
used to coat it with such a evenness.
Jonathan Bailey wrote :
>BTW - I'm quite certain that orotones utilized gold as a sensitizer in the
>process. It was not just that were gold backed images on glass plates.....
Any comment ?
Cheers