What is the "Magic White powder" exactly?

Oyvind

On Sun, 2004-02-29 at 10:22, Stuart Meier wrote:
> HI Gustav
>
> My 'lab' is centred around a UV exposure unit, laser transparencies and
> photosensitive boards. Couldn't live without them. Resolution down to 10 thou
> traces etc.
>
> I gave up ferric chloride, use magic white powder ( more unfriendly
> environmentally ie I can see how he etching is proceeding and it's less messy).
>
> StUart

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