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 but it can make the color a little more blue, a little more chalky. Most letterpress printers, including us, prefer transparent white for mixing (this is what the formulas use in the pantone guides), and then use opaque white if printing white on paper. Included in our Premium Ink Starter Pack. 2.8 lb can