Re: a measuring question

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From: Devra Goldberg (smspoll@yahoo.com)
Date: 07/01/03-02:39:20 PM Z

thanks, wayne! right now, i'm specifically looking
for chrome alum, but i'm also interested in the other
cyanotype II chemicals--ammonium iron oxalate and
ammonium dichromate, i believe.

--- Wayne Bowdish <wbowdish@mountaincable.net> wrote:
> Philippe is right - I have my copy of the 'Cookbook'
> in front of me and it has gram/teaspoon equivalents
> for about 30 chemicals.
> Info has also been posted to the list in years gone
> by, some of which I've noted saved.
> The equivalents I use mostly are (don't remember who
> posted this but thanks):
>
> Approximate Weight to Volume Ratios of a Few
> Chemicals
> (how many grams in tablespoons or teaspoons of dry
> chemicals)
> Chemical (in grams) 1 tbsp 1/2 tbsp 1 tsp 1/2
> tsp 1/4 tsp 1/8 tsp
> ferric ammonium citrate 12.5g 6.2 4.1 2.0
> 1.0 0.50
> potassium dichromate 22.0g 11.5 7.9 4.1
> 2.2 1.1
> potassium ferricyanide 15.5g 8.0 5.5 2.8
> 1.5 0.8
> silver nitrate 41.0g 20.7 13.8 7.0
> 3.6 1.8
> sodium thiosulfate 18.0g 9.0 6.0 3.0
> 1.5 0.75
> tartaric acid 12.6g 6.3 4.2 2.1
> 1.1 0.5
>
> Note that you will often find different values
> quoted. I assume that there are differences because
> of moisture content, manufacturing technique,
> crystal size and who-knows what else. For example,
> potassium ferricyanide is quoted as 15.5 grams per
> tablespoon above, 16 grams per tbsp in the
> 'Cookbook' and when I weighed mine a couple of
> months ago to check some course notes I was
> preparing came up with 16.4 grams per tbsp.
>
> Devra
> If there is a specific substance you need to know
> about let me know and I'll check the 'Cookbook'
>
> ----- Original Message -----
> From: "Philippe Ayral" <payral@club-internet.fr>
> To: <alt-photo-process-l@sask.usask.ca>
> Sent: Tuesday, July 01, 2003 11:28 AM
> Subject: Re: a measuring question
>
>
> > If my memory is still good there is some
> equivalent at the end of:
> > "Darkroom CookBook"
> >
> >
> >
> >
> > --
> > Philippe Ayral
> > http://perso.club-internet.fr/payral
> > http://www.focale.ch
> >
> >
>

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