Re: cyano recipe

Kris' figures don't look right.
There are 48 teaspoons (US) to one cup (US) water.
So, if Christina notes there to be 5 teaspoons of Ferric Ammonium
Citrate (FAC) to 100 mls or 3.3 ozs. (US)
. . . . . then, there are 8 ozs of water in one cup therefore 3.3 goes
into 8, 2.42 times.
. . . . . then 2.42 times 5 teaspoons is 12.12 teaspoons per cup of
water NOT 24

. . . . . or, looking at it another way, there are 236.588 mls in a
cup. Christine uses 100 mls for her recipe.
the 236.588 divided by 100 gives you, 2.36588 and that times the 5
teaspoons makes 11.83.

Well, then, 12 teaspoons per cup of water, or 1/4 cup of FAC to a cup
of water is correct.

Part B is right.

Jack (hope my math is good as I have the flu) Fulton

On May 3, 2005, at 6:57 PM, kris wrote:

> many thanks:
> i'll translate this further to
>
> A:
> a level 1/2 cup ferric ammonium citrate
> 1 cup water
>
> B:
> 1 heaping tablespoon potassium ferricyanide
> 1 cup water
>
> to mix 1:1
>
> best,
> kris
>
>
>
> Christina Z. Anderson wrote:
>> Yup I do, kris,
>> Solution A:
>> 5 tsp ferric ammonium citrate
>> 100 ml distilled water (3 1/3 oz.)
>> Solution B:
>> 1 1/4 tsp potassium ferricyanide
>> 100 ml distilled water (3 1/3 oz.)
>> At time of use, mix 2A: 1B.
>> Chris
>> ----- Original Message ----- From: "kris" <kris@eq-photo.com>
>> To: <alt-photo-process-l@sask.usask.ca>
>> Sent: Tuesday, May 03, 2005 8:15 PM
>> Subject: cyano recipe
>>> hey all--
>>> anyone have a basic cyanotype recipe that uses baking-type measures
>>> rather than weights? (I.e. 2 tbsp. pot cyanide + 4 cups water; 1/2
>>> cup ferric ammonium citrate + 4 cups water)
>>>
>>> trying to help out some high school kids...
>>>
>>> many thanks
>>> k
>>>
>
Received on Tue May 3 22:08:00 2005