On Tue, 10 Mar 2015 13:22:49 +1300
IVP <joecolquitt@clear.net.nz> wrote:

> what's your etchant ?
>=20
> I use clay paper with FeCl (because I still have some) and haven't
> noticed bubbling. I also float the board upside-down. Before etching
> I go over the board carefully and remove any unwanted clay.=20

Hi Joe.=20

I also use FeCl. But the clay is very firmly attached to the toner. When
the rinse water dries, the toner pattern appears as a light grey,
caused by the clay's presence.=20

Maybe the iron's temperature is too high... I'll try a lower temp
next time.

The bubbling is very evident in my case. If I put the board upside
down from the start, I get large areas which haven't etched due to
the bubbles. If at the bottom, and the solution isn't moved, the
PCB pattern is discernable from the bubbles ;)

Though I have not noticed it yet, I am somewhat worried that the
bubbling could damage the toner itself.

Thanks for the reply,
John

--=20
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