Equipment/PCB etch station: Difference between revisions

The bath for [[Project:PCB Making/Cupric_chloride_etchant|Cupric Chloride etch]] is being prepared in the tinning tank using the slow method : leave some copper in acid, allow corrosion to occur generating some oxides, add further copper and acid as required. Water, acid, copper and hydrogen peroxide (if used) should be noted as it's easy to over-dilute if you just add stuff randomly.  

The preparation so far contains 540g copper, 2900ml 38% HCl, 1750ml water. SG is 1260. This is ready for use - air has been bubbled through it and it has reached the bright green colour indicating it has converted copper to cupric chloride. The acid concentration appears to be correct and I have reconnected the heater. It may be used for etching, but there is no large air bubbler in the tank so may need to be agitated by hand (jiggle the basket containing your PCB). If the etchant is not bright green, please leave the small fishtank bubbler running. The bubbles will regenerate the etchant.