Homebrew PCBs

What is the paper? Do you know what the residue is?

Donald.
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----- Original Message -----
> From: "Kerry Koppert" <kkoppert@...>
> To: "Homebrew PCBs" <Homebrew_PCBs@yahoogroups.com>
> Sent: Friday, August 2, 2013 5:42:06 AM
> Subject: [Homebrew_PCBs] Glossy coating removal
> 
> I've finally found a paper that works with the laser transfer method.
> Only problem, it leaves a fine residue behind on an between the pads of
> smaller smd i.e, ssop pic processors. Is anyone aware of a chemical
> agent which will loosen this coating without lifting the laser transfer?
> I'm trying dilute caustic soda which looks promising.
>