Opaque White letterpress ink is also called Printing White. It’s a favorite of letterpress broadside printers because it has less show through of the paper and the white ink will “pop” off the page. It is sometimes used also as an undercoat on dark paper before printing another ink color over it.
Some printers use opaque white for mixing and they swear by it. Note that it can make the color a little more blue, a little more chalky. Letterpress printers use their own judgement for which white they use, either transparent white for mixing (this is what the formulas use in the pantone guides), or use opaque white if they are trying to achieve an ink color with over 95% transparent white. Included in our Premium Ink Starter Pack. 3.3 lb can
Van Son Rubber Base is now Classic Plus.