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Don't re-invent the wheel. Unless your in the backwoods someplace (don't get me wrong, I love the back woods) there's an ink manufactureing rep close by to talk to. Call any of the larger ink manufacturer's (Coates, Sericol, Naz-Dar....) and talk with their tech department or customer service. I'd be surprised if they wouldn't send a salesman around if you asked.
BJ,
The reason your color changes on white ink is simple, a white T-shirt is mostly cotton, nice and soft, a white underbase is a film of cured plastic, hard and un- receptive, it is firmly rooted in physics, different sub-strates reflect and bend light waves in their own special way. Hopefully when your undercutting prices and helping to destroy the screen printing industry you will beat this lesson into the useless designers you will have to hire and pay, and maybe you will not drive the quality standards even lower into the ground while you learn to master the equipment you've bought. Not to be mean, but I had to leave the industry and learn off-set and Flexo to get paid $100,000 a year, because 80% of the shops I worked at (WINTERLAND) are out of business now, and the rest of 'em do contract printing, just like a whore on the street corner. Remember when we made money on the garment? Not just the printing? Thomas Dunn thomasdunn13@comcast.net
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Most all manufacturers are at the Big annual show (SGIA) in Atlanta. What size mesh are you printing through on the underbase? What size mesh are you printing the top coat? What tension is your screen? Are you printing off-contact? What durometer squeegee are you using? Are you flashing? What temp and how long? As you can see it is not just a magic white, but mechanics too. Review these things too.