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The phrase 'red lead' is generally not correct and not generally used in written English. However, it could be used informally in some contexts. For example: "I grabbed a pencil and some red lead and started writing down my ideas."
Dictionary
red lead
noun
A bright red, poisonous oxide of lead, Pb3O4, used as a pigment and in glass and ceramics
synonyms
Exact(60)
Metals subject to corrosion may be primed (and protected) by red lead or iron oxide paints.
But it was found there was red lead in the cinnabar & this was causing her illness.
In this process, the litharge takes on more oxygen to form red lead.
Enamel is a comparatively soft glass, a compound of flint or sand, red lead, and soda or potash.
A mixture of finely powdered sulfur and red lead is blown through a cloth screen onto a charged crystal.
The MiniDarts come with a comely red lead, which should make them stand out if you misplace them.
XRD-analysis proved the presence of lead tetroxide (red lead).
The analysis also demonstrated that Bauer generally used red lead, red lead mixed with vermillion, red lead mixed with a yellow pigment or vermillion mixed with a yellow pigment in order to produce orange in the Fauna Graeca paintings.
For example, points at 550 and 600 nm are specific to red lead.
The PLM photomicrographs of sample zx2-3 and zx2-4 show the characteristics of red lead.
For example, the points at 550 nm and 600 nm are characteristic of red lead.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com