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#1
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Toning developer
Hi people!
In these days I'm looking at the different recepies for home made developer and their effect on the paper. I found that generally speaking the restrainer can induce a tone in the print - high percentage of KBr will give a warm toning, benzotriazole a cold one. Do you have any idea about the mechanism of this toning? In a page (I forgot the address) I found that the restrainer affect the growth of the silver grain and for this reason the scattered light can have different tone, but it sounds a little bit strange to me. Thanks and bye Elia Freddi ················································ |
#2
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Toning developer
Elia Freddi wrote
Hi people! In these days I'm looking at the different recepies for home made developer and their effect on the paper. I found that generally speaking the restrainer can induce a tone in the print - high percentage of KBr will give a warm toning, benzotriazole a cold one. Do you have any idea about the mechanism of this toning? In a page (I forgot the address) I found that the restrainer affect the growth of the silver grain and for this reason the scattered light can have different tone, but it sounds a little bit strange to me. Thanks and bye Very fine silver in an emulsion is black. Silver plate is, silver. Very fine gold is purple. I don't think the two "toners" you've mentioned combine with the silver. More information on the subject would be interesting but I would'nt know where to look. Dan |
#4
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Toning developer
On Mon, 15 Mar 2004 17:11:09 +0100, Elia Freddi
wrote: I don't think the two "toners" you've mentioned combine with the silver. I agree with you, they should have effect only on the action of the reducer, not on the color of the silver - they are just restrainer. Just wondering how they can affect the tone. Finer grained developers produce slightly warmer tones. Regards, John S. Douglas, Photographer - http://www.darkroompro.com Please remove the "_" when replying via email |
#5
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Toning developer
Do you have any idea about the mechanism of this toning? In a page (I
forgot the address) I found that the restrainer affect the growth of the silver grain and for this reason the scattered light can have different tone, but it sounds a little bit strange to me. That's right. The difference is in the size of the silver crystals at a microscopic level produced by different developers. Small, finely divided crystals reflect brown. Larger ones tend toward black and blue. |
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