RE: Volume to weight

Katharine,
To answer your question, about 15 cc of tapped carbon black in a beaker is
2.5 grams. And every time you open a container with it you end up with such
a mess.
I ran out of HP transparency yesterday and used something else (it is
Crystal Clear brand that I use to print gum negatives). The back exposed gum
just slides off from it. No good for back exposing. I need to get some more
HP transparency. Did you mention that one of your brands of transparency
film did not work as well?
Marek

>From: Katharine Thayer <kthayer@pacifier.com>
>Reply-To: alt-photo-process-l@usask.ca
>To: alt-photo-process-l@usask.ca
>Subject: Volume to weight
>Date: Wed, 03 May 2006 08:14:43 -0700
>
>
>On Apr 27, 2006, at 9:14 AM, Katharine Thayer wrote:
>
>>
>>On Apr 26, 2006, at 2:56 PM, Marek Matusz wrote:
>>
>>
>>
>>>To clarify my recipe, my gum mix consisted of 0.25 g of dry lamp black
>>>from Daniel Smith (or is it called carnbon black?, can't remember at
>>>this moment), 3 grams of dry gum (I actually used 10cc of 14 baume gum
>>>which is about 30%)
>>>
>>
>>Obviously there's no way to compare this to the amount of paint I'm
>>using, as we don't know how much pigment is in a given amount of a given
>>brand of a paint made of a given pigment.
>
>I've been doing some studying to try to find a way to ballpark an estimate
>of the amount of pigment in my paint, so I can get an idea of how our
>recipes compare. It could only be a ballpark, since of course paint
>brands differ in their pigmentation, but I was just trying to get an idea.
> What I have found has surprised me. For some reason I always thought
>there would be more vehicle than pigment in paint, but that's not of
>course the case at all.
>
>Unfortunately I've only been able to find general recipes, not
>pigment-specific recipes, and I've only been able to get amounts in volume
>rather than weight. Since I have neither powdered pigment nor a scale that
>weighs that fine (lamp or carbon black are very light pigments) I need
>help translating volume to weight. Marek, how hard would it be for you to
>give me a translation of volume to weight for your carbon black? Say, how
>many tablespoons or teaspoons or whatever measure of volume you might have
>available is a gram of powdered carbon? Don't go to a lot of trouble,
>but if it's not too hard, I'd like to know,
>Katharine
Received on 05/04/06-03:09:57 PM Z