Let’s start off by being clear: this is a two step tutorial. The first step is to mix pigments with a medium. And no, they’re not hard to find special products from the other side of the planet.

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Coffee farmers may have a new tool to use in the near future to combat coffee leaf rust, a threatening pathogen that has been found on Maui, Lanai, Hawaii island and Oahu. With Hawaii’s $56 million ...