Richards, Justin P wrote:

> Someone mentioned the ink used to date code products like soft drink
> bottles.  It certainly is water insoluble, however I was led to believe the
> stuff is quite poisonous.  They had quite a procedure at coca-cola for the
> refiling and disposing of empty containers.


Sounds expensive too, ie used in very small
amounts per "numbering". I'm thinking some
type of lacquer or coating that is fairly cheap
and alcohol or alcohol/water soluble, but dries
to waterproof.

Even if clear it can easily have some dye added
making it easier to proof check the PCB.

If I get out tomorrow I might visit the arts and
crafts shop and see if they have anything. :o)
-Roman

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