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----- Original Message -----
Sent: Friday, October 20, 2000 2:52 PM
> 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 ?
> opacity of gold coat isn't so high but it works very well. Tomorrow I
> 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,
> 2. the gold coat exists only after the regular processing. What's the
> used to coat it with such a evenness.
> Jonathan Bailey wrote :
> >BTW - I'm quite certain that orotones utilized gold as a sensitizer in
> >process. It was not just that were gold backed images on glass
> Any comment ?
Let me clarify:
Orotones are positive prints on glass with gold leaf on the back to display
these 'transparencies' without transmission (rear) light.
My question was to know if anyone could say what the emulsion Curtis used
for the image itself. The coating was gold leaf.