Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, Stefan Trethan
<stefan_trethan@g...> wrote:
> why is food coloring not pigmented?

It is a dye. I've got some red here, says "FD&C Reds 40 and 3, adn
Propylparaben (as a preservative)".

FD&C Red 40 and 3 are mentioned specifically on several official sites
as "dyes, colorants" including this one:

http://www.kochcolor.com/foodsdrugscosmeticspricelist.htm

> you soak it in ipa?
> i fear that the ones i get will also not clean up!
> was it clogged by inkjet ink or "some experimental color"?
> 
> how long was it lying around dry?

I think the next one I'm using only isopropyl alcohol to soak.

These are from thrift stores so I have no idea how long they sat. It
is unlikely any experimental inks were used in them.

Ingredients listed on one of my cartridges:
Glycerine
Ethylene Glycol
Isopropyl Alcohol

Steve Greenfield