Homebrew PCBs

> How much knowledge to you have on ink formulations ? Its an entire 
field 
> of expertise. Inkjet ink chemists are specialized people. You want 
to 
> develop your own inkjet ink that gives high image quality AND can 
also 
> forms a stable acid etch resist ? !  My best bet would search 
> http://www.uspto.gov and see if anyone else has done it.  
> 
> The reason why everyone uses photoresists is because it works the 
best. 
>  The phototool  is important, and I've only ever seen good ones 
from an 
> inkjet./transparency, I've also seen many more bad ones from 
various 
> inkjets and inkjet transparencies. Its important that the ink and 
> transparency are compatible with each other, otherwise you get pin 
> holes, banding and rough edges. The Epson stylus series do very 
good job 
> with their dye based black inks on their transparency. Only problem 
they 
> are expensive. I suspect Epson have patented their transparency 
because 
> no one else make one the same. You can print on it then dunk it in 
water 
> and nothing happens to the ink. There are other transparencies that 
work 
> well with the Epson black ink. The HP inkjets use a pigment black 
and do 
> not go so well on Epson transparencies. Use HP transparencies with 
HP 
> ink, the results are quite ok.



I'm not looking for ink for an ink-jet, I am looking for ink that one 
would use for silk-screen type printing.

Ink for printing with an ink-jet print head would be very thin.  I am 
looking for a nice thick almost paint like ink that is acid (etch) 
resistant.

I have been reading more and more about a certain kind of etch resist 
pen that uses a laquer based ink.  Perhaps I will try some type of 
laquer paint/ink.

I am also considering the photoresist method as it sounds like this 
is the method of choice here.

I will start a new thread.