If you have an element you'd like the ink to match, like an envelope, a liner, or digitally printed piece, the best way is to send me a piece so I can match it in person.
Many times I can mix inks to match in-house but sometimes I'm missing a key ingredient, or it looks really tricky, so I'll order it pre-mixed. I use the Austin-based Southern Ink Co. for that.
Sadly, there's still no perfect "white ink" for letterpress - it always comes out semi-transparent and a little fuzzy. I'm not giving up, just haven't found a solution yet. Still working on it!
Got a project you need printed? Email us to get the ball rolling, and don't forget to specify which Pantone (uncoated) number you'd like for the ink!