including the messy old standby etchant ferric chloride, or even [Sebastian]’s preferred sodium persulfate method. Being out of that etchant, he decided to give the acid-peroxide method a go and ...

[Stephen] often finds the need to make his own PCBs at home, and when he got the urge to do some etching recently ... A fair warning however, standard ferric chloride disposal procedures need ...

ferric chloride, 2 ml. concentrated hydrochloric acid and 99 ml. methyl alcohol) etching for 20–60 min., revealed cracking as the principal deformation mechanism and twinning as the secondary ...