RE: acetone

Cheers Sandy,

I have tried it only once but got streaking. I will learn to do it.

Regards,

Witho

-----Oorspronkelijk bericht-----
Van: owner-carbon@spitbite.org [mailto:owner-carbon@spitbite.org] Namens
Sandy King
Verzonden: vrijdag 22 december 2006 16:23
Aan: carbon@spitbite.org
Onderwerp: Re: [carbon] acetone

I am currently calibrating spirit sensitizing with a 1:2 mix of
ammonium dichromate solution:acetone, using 8 ml of combined solution
per 8X10" size tissue or the equivalent. A 12X20" tissue has three
times the area of an 8X10 so for that size I would use 24ml of total
solution, 8ml of ammonium dichromate solution + 16ml of ammonium
dichromate. I coat twice, using half of the total solution with each
coating. I use a foam brush, which I first wet out and shake to get
rid of excess water, and for the second coating I wet it out again
and shake.

The foam brush works so well for me that I have not ever felt the
need to try anything else. The sensitizer penetrates all the way to
the base of the tissue using this method, as effectively as it does
with tray sensitizing. I recall some speculation here in the past
that spirit sensitizing might wet out only the surface of the tissue,
but based on the kind of relief I am getting with spirit sensitizing
it is obvious to me that is not the case.

Sandy

At 1:23 PM +0100 12/22/06, Witho Worms wrote:
>Sandy or anybody else,
>
>
>
>How much acetone - ammoniadichromate mix do you use for a 12x20 inch
>negative, tissue slightly bigger of course.
>
>
>
>And, have you ever tried to use a sponge, to rub the tissue in, so that you
>more or less saturate the top of the tissue.
>
>
>
>Witho
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Received on Fri Dec 22 09:09:53 2006