Check the containers used to store the etchant during cleaning. I have
experienced a similar situation, the operator used an old flux drum to
store the etchant that was not properly cleaned, hence foam.

Lenny Kurup

On Thu, 19 Nov 1998, Chemitalic A/S wrote:

> Hello all
> Is there anybody who have seen this problem:
> Foam in an ammonium chloride etcher
> What is the reason for that?
> We have cleaned the machine during the weekend and after that, the machine make a lot of foam.
>
> Jesper Pedersen
> Process Engineer
> Chemitalic A/S
>
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