Dorothy Fitzpatrick wrote:
Why do you add H202 if I might ask? Is it not clear to start with? dee
On 22 Jul 2009, at 12:26, Peter Converse wrote:
Hi Marshall and other list members,
My EIS was 24 hours old and approximately 25 ppm. It was only
slightly yellow but possibly on the way to a deeper shade.
I have been able to use 3% food grade H2O2 to clear a ~25 ppm. batch
in the past by adding up to one drop per ounce, as I did this time,
but in this case I made mud. I didn't want to wait another day to add
the peroxide (which I probably should have).
I recall that my earlier successes involved a more stabilized EIS, as
you suggested; one having sat on the shelf for several days before
adding H2O2.
H2O2 does a redox on the CS/ionic silver combination. It oxidizes the
colloidal particles making ionic, and reduces the ionic, making 2 atom
colloidal particles. The effect is to reduce the particle size of the
colloid to almost 100% 2 atom particles, and also to increase the
colloidal portion from about 10% to what is estimated to be 25 to 30%.
Marshall
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