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Use "blacklead" in a sentence
"The process of electrotyping is as follows: The form is locked up very tightly, and is then coated with a surface of graphite, commonly known as blacklead, but it is a misnomer."
"She came to the door in her sacking apron, a blacklead-brush in her hand, and a black smudge on her nose."
"For there was, as it follows afterward, Grecian hyssop: fucous hyssop, perhaps of the colour of blacklead: Roman hyssop, and wild hyssop."