Gary,
You might want to avoid etching anything but PCB
in your main etch bath. Make up a seperate little tank
for playing with brass or anything else.
Brass is 30% zinc on average; and zinc is highly reactive.
It makes a great catalyst for decomposing H2O2. I can
imagine many different baths that it wouldn't be good for...<g>
Also, wasn't the "original" formula for this etch-bath
specified for -2- percent H2O2 ??
Your out of control exothermic reaction sounds like too
much H2O2 to me...
good luck, and please report back here how you solve
each issue!
--
============================
Please do NOT add or "subscribe" my name to ANY lists/databases.
You might want to avoid etching anything but PCB
in your main etch bath. Make up a seperate little tank
for playing with brass or anything else.
Brass is 30% zinc on average; and zinc is highly reactive.
It makes a great catalyst for decomposing H2O2. I can
imagine many different baths that it wouldn't be good for...<g>
Also, wasn't the "original" formula for this etch-bath
specified for -2- percent H2O2 ??
Your out of control exothermic reaction sounds like too
much H2O2 to me...
good luck, and please report back here how you solve
each issue!
--
============================
Please do NOT add or "subscribe" my name to ANY lists/databases.