[hackerspaces] Instructable: Super easy PCB production with vinyl masks

[Harry]

> Comment 2.  What exactly are you using as etchant?  Ferric chloride is
> the stuff I know.  Granted, I wouldn't want to eat the stuff or swim
> in it,

Well, my tronix shop sold me a bag of Ammoniumpersulfat. The dutch
wikipedia page on this stuff says it is used for both etching PCB's _AND_
it is an add-on to improve bread, known as E923.

I wish you one very happy breakfast.

http://nl.wikipedia.org/wiki/Ammoniumpersulfaat