Homebrew PCBs

On 28/10/12 16:38, dubob4432 wrote:
> Thanks.
>
> When you say 'bubble air through it' you mean like w/ a fish tank air pump w/
> those 1 way valves?  Do I know how much air I need based off the color and if
> so, what color am I looking for?  In the past I had some weak acid and it
> turned teal blue but this stuff is staying bright lime green.
>
> Also, yes, I did heat it up.  I was using a small 'tupperware' dish in a
> larger one that was filled w/ water ~120-140F.
>
> When you say a bit slower, I assume you mean than the first batch and not my
> slow 45min marathon etch?

Using my FeCl bubble etcher which has degenerated to a copper-chloride etcher, 
doing a double-sided 1oz copper pcb is well done by 12 minutes, without heating.

Add a bit of HCl acid every few months. The FeCl/water ratio started at 1:1 a 
few years ago. Keep the tank covered when not in use.