Results of test are in.
1 Amount of total brd space 3 3/4in times 4 1/4in times two sides.
2 sanded brd done first, sos done a close second & untreated brd third but not
by a long period of time.
3 Unheated room temp etchant 22 min total time changing dark etchant once.
If I am unhappy with the length of time due to old products can I increase the muratic acid part with no side effects to traces?