system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If hair and fingernails are made of the same thing, why don't your fingernails match your hair color?
gpt
Even though both fingernails and hair is made of the same material hair also has something called Melanin in it that gives it color while fingernails do not.

Think of it as having made to chairs that re both made of wood, but one is painted the other is not. You would still say they were both made of the same material even though the painted chair also had paint mixed in with it's building material because the majority of the things (in this case wood) used to make the chairs was the same.

So yes they are more or less made of the same thing, just not 100% the same thing.