HAEMATITE

A hard, compact nearly pure natural variety of anhydrous ferric oxide. Although probably this compact form of haematite was sometimes ground and used for a dark purple-red pigment, ordinarily it was for the preparation of burnishers for gold leaf.

HANSA YELLOW

A new coal-tar pigment, said to surpass cadmium lemon in permanence. It is durable in both lime and oil.

HARRISON RED

Said to have gotten its name from the artist Birge Harrison; it is a brilliant red lake color or toner which is similar to, if not identical with Toluidine red. Some other lake colors, may also be sold under that name.

HELIO FAST RED R.B.L.

Along with lithol fast scarlet, these are coal-tar lakes which serve as substitutes for vermilion. Helio fast red is a brilliant color which is permanent in watercolor, tempera and fresco, though with slightly better success indoors than outdoors. There is however still the question of the usefulness of coal-tar colors, as it is said that they turn brown in oil, and Helio particularly has been known to attack the metals of tubes, thus they have to be covered with a protective lacquer before filling. This is another vermilion substitute which is still somewhat questionable.

HONEYSUCKLE AND NIGHTSHADE GREENS

Besides the greens from buckthorn and iris, other vegetable greens were known in the fourteenth century, some seldom recorded such as one made from "the flowers of the plant called Aquileia," which we think may be what we now call Columbine. Two, however, that seemed fairly important: one made from the berries of honeysuckle, the other from the leaves of most especially, nightshade. Honeysuckle green seems to have been an Arabic tradition, sometimes described as "Saracenic", and in the recipes it is always given an Arabic name. Processes for making greens from the leaves of Solanum, Nightshade, go back to the thirteenth century and possibly earlier. Elder and mulberry leaves also yielded greens, and rightfully so as chlorophyll, the natural green color-matter of leaves, was the chief pigmentary constituent of the product.

HYDRATED CHROME OXIDE

Same as Green Emeraude or Veronese Green.