--- In
Homebrew_PCBs@yahoogroups.com, Alberto Colorado <albertocoloradoaxl@...> wrote:
>
>
> Hi,
>
> I'm from Colombia, excuse my English.
> I always wanted to know the formula of "fotorresist" or something similar to make PCBs.
> Does anyone know this?
>
> Here's an example:
>
> 1. Silver nitrate .......... 25%
> 2. Silver Clouro .......... 25%
> 3. polyvinylpyrrolidone K30 .....0.54%
> 4. sodium carboxymethylcellulose..... 0.9%
> 5. Distilled Water .............48.6%
>
> ... or anyone knows of a different formula and easily?, if it is possible that "revelator" can use.
> some of these chemicals are not available where I live!
>
> Thanks!
>
>
>
It's hard enough to make the commercial stuff work, I wouldn't even consider trying to make the resist myself. Just buy a can of the stuff, or better yet, buy pre-coated boards. If you cannot buy it locally you can order it online.