Judy Seigel (jseigel@panix.com)
Sun, 24 Jan 1999 12:11:43 -0500 (EST)
On Sun, 24 Jan 1999, Sandy King wrote:
>
> Quite frankly I don't know exactly what the bromide does but it is
> recommended in the formula of several super proportional reducers that I
> have on hand. I am going to assume that its primary function is to restrain
> the heavier silver deposits and reduce overall density, but this is only
> speculation.
Contemplating a 36 bit scanner, I feel I have bits to burn -- so here are
two of them, a propos of Sandy's mention of "super proportional reducers."
My disclaimer up front is that I am not your utmost darkroom maven --
BUT:::::
I seriously doubt that in today's arena the so-called super-proportional
reducers actually are. According to my tests on a couple of films, the
curves of ALL reducers were more or less the same, no matter what they
were called, except for one: RA4 bleach (if memory serves) It came from a
color kit, was recommended in whatever they called the magazine that
became Photo Techniques, and really did reduce contrast with little or no
loss to shadow detail.
The others, Farmers of one ratio or another, persulphate of different
persuasions, and so forth, *dropped* the line on the chart, an inch or
whatever lower, but the *slope* remained the same.
I forget which superproportional Sandy is using, but the term could
possibly bear some clarification.... and I might stand corrected....
cheers,
Judy
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