Homebrew PCBs

--- 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.