Homebrew PCBs

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!


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