Sepia tone is silver sulfide. Silver will react with active forms of
sulfur to get this, hydrogen sulfide (rotten eggs, flatulence), sulfuric
acid and other sulfur compounds.
Marshall
Rowena wrote:
Think on now, Tom - you said sepia tone.
What else is sepia tone? - old photos.
Very old photos used silver in the process, and this turned brown in
the light.
It's a 'silver' thing.
You nearly took a photo of something! (Well, OK, you didn't really,
you just saw part of the old process)
R
On 13/05/2010 7:28 AM, poast wrote:
I have a small abrasion on my forearm. I decided to dip a
cotton ball in
some of my EIS concentrate and tape it to my arm for a couple of hours. I
was out in the sun for part of that time. When I came back in, I noticed
that the cotton ball had turned brown.
I then took a fresh cotton ball, soaked it with the EIS concentrate and set
it outside in the sun. It turned brown in a little over 15 minutes.
I then took another fresh cotton ball and soaked it with my EIS and set it
outside in the sun. To my surprise, it also turned brown.
When I make EIS, I start with distilled water that has a conductivity of
less than 0.5 uSeimens, and the EIS comes in at about 14 uSeimens of
conductivity. To make the EIS concentrate I put EIS in a stainless pan and
warm it up. When the volume is reduced to about half, I stop. In this case
the conductivity came in at 34 uSeimens. The solution remains clear and
there is no percipitate of silver in the bottom of the bottle that it is
stored in. This concentrate is for external use only and I have done this
several times without incident.
Why is my EIS and my EIS concentrate photo sensitive?
Is this normal?
The brown is like a dark sepia tone.
Tom
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