The lead of pencil is made by mixing clay with powdered ______
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Solution
Most pencil leads are made from graphite powder mixed with a clay binder.
Graphite pencils (formerly known as "pencils") produce gray or black marks that can be easily erased, but otherwise moisture, most chemicals, UV radiation, and Resistant to natural aging.
Thus, The lead of the pencil is made by mixing clay with powdered graphite.