Homebrew PCBs

On 08/07/13 01:06, Duane C. Johnson wrote:
>
>
> I agree, the bath must be alkaline and a common
> and convenient alkaline bath is "Sodium Hydroxide".
> I get mine at the local hardware store where
> plumbers use it as a drain cleaner.
>

Drain cleaner, soap manufacturing, methamphetamine production and 
melting the flesh of your enemies... all popular uses for sodium 
hydroxide (lye).

Sodium carbonate is way way safer, and works just as well (the 
"developer" that some ebay sellers include with their dry film, it's 
just sodium carbonate).  It's found in a large variety of household 
products in the laundry aisle of your local supermarket, look for 
natural fabric softeners and laundry powders.

Takes a little longer, but you don't have to worry about chemical burns, 
or having (more) hazardous chemicals around the place, and much less 
chance of leaving it too long and stripping the resist when you were 
just trying to develop it.


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