IRON-GREY.
For iron-grey it is necessary to boil the same as for blues: this colour is much more beautiful when laid on a very white ground.
By having the drugs made into decoctions before-hand, greys either in woollen, silk, or cotton, may be dyed at a heat not much above what the hand will bear; and in a rotation of shades from light to dark, and varied, blue, red, yellow, brown, &c. with ease and with pleasure; so may, likewise, many stone-drabs, and other light brown drabs, as the mixture of yellow, fawn, and black, produces nut-browns, &c.