The ‘Masters of Science’ series includes all inks that we’ve made that offer unique physical and chemical properties. These inks include our Darwin series of fast-drying inks, our pigmented inks that include Gregor Mendel Pea Green (colored with chlorophyll!), Accident Blue, and Isaac Newton Black. Also included is our revolving series of iron gall blue ink, Aristotle. Aristotle is made in very small batches with some slight variation of the shade of blue.