Homebrew PCBs

I just tried the HCl/Peroxide etchant solution. 1.5 parts 40 volume 
Hydrogen Peroxide to 1 part HCl (Muriatic Acid)

WOW! A very active etch. Took under 1 minute to etch a 2 sided board.
The solution went from clear to bright green and bubbled furiuosly.
After 20 minutes its still bubbling.

If anyone has experience with this etch solution. Does it stop 
bubbling? Is it storable? Were my proportions correct?

I never was worried about undercutting , but with this etchant, I will 
definately be concerned.

TANSTAAFL!

Myc