----- Original Message -----
From: "Luis Miguel Castañeda" <lmc@xxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Tuesday, September 19, 2006 12:37 PM
Subject: [pure-silver] Re: Blue Water
But the base color does not come out. Most 35mm black and white negative films have a pigment in the support to prevent condution of light longitudinally through the base (light piping). This is not removable. While it also acts to reduce halation most films also have an anti-halation dye in the back coating. Halation is the refection of light from the back of the film causing halos around bright highlights. Most color films have the anti-halation layer coated under the emulsion, a more effective location which also serves to eliminate light-piping so the support does not need the pigment mentioned above.
On 19/09/2006, at 21:33, Georges Giralt wrote:
I do not know exactly why this does not happen so heavilly in 135 film, but sometimes there is a faint color for 135 film.
because most 135 films have a coloured base.
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