All of the following are examples of commonly used tools in relief printing, except which?
a. lead
c. paper
b. mat knife
d. gouge

All of the following are examples of commonly used tools in relief printing, except which?

a.

lead

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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