Luckily, [Rich] has come up with a way that eliminates multiple prints and the acid needed for etching. His process involves using a laser printer (as opposed to an inkjet printer, as is tradition ...

One way of putting an etch mask on a PCB is with the toner transfer method: print your circuit on a piece ... He used Muratic (Hydrochloric) acid and Hydrogen Peroxide with a sponge to wipe ...