Re: Why so much

There is no fixed amount of gelatin needed to make carbon tissue, but
practical considerations suggest that the range is from a low of
about a 5-6% solution to a high of 15-20%. That is, from as little as
50 grams of gelatin per liter of pigmented gelatin solution to as
high as 200 grms. Considerable complications are introduced at both
ends of the range. The amount used also depends on the setting
characteristics of the gelatin being used, its Bloom, and the degree
of relief desired.

I personally use about a 12% solution of 175 Bloom porcine skin
gelatin, with characteristics very similar to the Knox that Vaughn
uses.

Sandy

>Hello Yves,
>
>I have joked to the students about my "Jello" Prints (Jello is a brand name
>of a gelatin dessert here in the USA). Perhaps trying to make a print with
>an envelope to 500ml would create a mess only worth eating.
>
>I use the amount I do because someone at sometime used that amount, it
>worked, and I have blindly followed their instructions -- 12 packets, or
>about 85 grams, for a 750 ml batch of solution. Never tried less, never
>tried more...sort of a "It works so don't break it" type of thing.
>
>My assumption has been that about 150 years ago someone tried different
>amounts and found that this amount works. Might be fun to double the amount
>and see what happens, but I'd rather spend the time making beautiful
>objects...and my latest prints...yummy!
>
>But perhaps someone here actually knows the answer, besides my rather silly
>assumptions/explanation.
>
>Vaughn
>
>> I've been reading the archive a bit and I was surprise by the amount of
>> gelatine some of you used. On a pouches of Knox it's written "This
>envelope is
>> pre-mesured to set 2 cups (500ml) of liquid." I ask myself why do they use
>so
>> much ( ~6-7 times+)??? And I decided to ask instead of trying to figure it
>> out.
>>
>> Thanks
>> Yves
>_______________________________________________
>Post to the list as PLAIN TEXT only - no HTML
>carbon mailing list
>carbon@spitbite.org
>FAQ at http://spitbite.org/carbon/list.html
_______________________________________________
Post to the list as PLAIN TEXT only - no HTML
carbon mailing list
carbon@spitbite.org
FAQ at http://spitbite.org/carbon/list.html
Received on Thu Dec 1 09:14:22 2005