satt och tänkte lite och kom på en rolig idé, finns ju bla fosforsyra i coca cola så varför inte prova att etsa kretskort med det... (hade rätt tråkigt den dagen)...
Two copperclad PCB's are placed in beakers with one Coca Cola and the other Coca Cola Light.
(Pepsi was also evaluated but didn't meet standards)
About 1/5'th Hydrogen Peroxide is added as oxidizer.
(much less than I use when etching with hydrochloric acid - which might also explain the longer etching time)
After a couple of hours (depends alot on temperature),
the liquids turn all transparent for some reason.
The blue comes from the copper disolving.
And for some other reason - the Light turns all goo-ey and doesn't etch at all basically, so Coke Light is out of the competition.
Time goes by!
After a mishap I had to redo the test, therefor the liquid ain't as blue as it would be.
Here you see it's etched alot already.
This is the final phase - where the _real_ etching starts,
liquid turns deep blue and almost boils.
It'll take a couple of hours for the reaction to get to this stage -
instead of having the pcb's inside I recommend this is when you add the cards to prevent ink from unnessecary disolving.
The solution is self heating, and at the point of boiling - yes it WILL -
it will boil like crazy until the beaker is empty -
also releasing a nice cloud of smoke - maybe it's just vapor , didn't feel like sticking my head into it.
Here it's all boiled over into the bucket but hey - the card's finished so it's okay!
Result: Coca Cola etched PCB's!
I simply used a magic marker to write the stuff onto it,
of course you could use photoresist developed cards for much better result.
And more hydrogen peroxide for faster etching.
NEAT HUH?
