Homebrew PCBs

--- Adam Seychell <a_seychell@...> wrote:

> The black ink in my old Epson 660 is extremely UV
> blocking. I can expose a PCB over 5 times normal and
> still not manage to effect the dark areas.

Well, I'm no expert in the area of optical physics. 

So, I intend to make a test transparency that is
composed of the same test pattern repeated several
times using  different colors. Then I'm going to use
it to make a test board. My reasoning behind this is
simple: Even if I knew a lot about optics (Which I
don't), without knowing the exact chemical
compositions of the ink I use along with a detailed
description of the physical characteristics of the
photo resist that I use, I'd only be making
conjectures regarding the results as reported by the
original author of the email. 

Further, the information that I gather from this
experiment will likely only be applicable the the ink
I am using and the photo resist I am using. Different
inks and photo resists could possibly give different
results.

Also, the results that he described could be explained
totally by the chemical makeup of the ink: Perhaps the
chemical composition of the color of ink that he used
is less prone to having a jagged meniscus (In other
words, a very smooth and symetric meniscus) between
the ink and the transparency.

OTOH, this may be a total load of bullsh!t and a waste
of my time. I'll let you know...


Best

Marvin Dickens

=====
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