• Of this word “enamel” Mr. Ruskin, Modern Painters , III 227, remarks:⁠— “The first instance I know of its right use, though very probably it had been so employed before, is in Dante. The righteous spirits of the pre-Christian ages are seen by him, though in the Inferno, yet in a place open, luminous and high, walking upon the ‘green enamel.’ “I am very sure that Dante did not use this phrase as we use it. He knew well what enamel was; and his readers, in order to understand him thoroughly, must remember what it is⁠—a vitreous paste, dissolved in water, mixed with metallic oxides, to give it the opacity and the color required, spread in a moist state on metal, and afterwards hardened by fire, so as never to change. And Dante means, in using this metaphor of the grass of the Inferno, to mark that it is laid as a tempering and cooling substance over the dark, metallic, gloomy ground; but yet so hardened by the fire, that it is not any more fresh or living grass, but a smooth, silent, lifeless bed of eternal green.