FWIW, I view this and other Yahoo groups via email and I did get the graphs. Seems some groups allow attachments while others don't. Not sure how this relates to viewing via Yahoo.
Another Keith
Keith Schreiber
On Feb 27, 2014, at 6:53 PM, beefyzee@... wrote:
Hi Pete,
can't see those graphs anywhere (I absolutely hate this new Yahoo Groups design) but I'm quite interested to know how different inks block UV.My interest is because I'll be using QTR to make circuit boards and the less ink I have to lay down the better edge quality I can get on my transparencies.The screenprinting guys that do T-shirts use special fast drying high opacity black inks, purposely made to block UV. I just made a tiny little circuit board and the ink was nothing more than the stock standard dye ink the my Epson TX810FW uses. I used black only but I've heard yellow is very good at blocking UV. Using just the one transparency (i.e. not 2 stacked) and exposed my circuit board for 3 mins (instructions say max of 90 seconds) and the board suffered no exposure where the ink was blocking it.Keith.