Question

Gas chromatography can be useful in determining what about paint?

Answer 1

Gas chromatography can be useful in determining what about paint?

Its color

Its pigment

Its age

Its chemical composition

Answer 2

Gas chromatography is a type of chromatography that is usually used in analytic chemistry in order to analyze and separate the compounds that can be vaporized without decomposition.

Based on this:
Gas chromatography can be useful in determining the chemical composition of paint.