The yellow ones are brass. The bright silver ones are nickel-plated brass. A few bullet cases are made from aluminum, and even fewer are made from a mild steel. But, if grandpa was reloading his own, he was using brass.
I almost forgot, a few were made from copper as well.
You'll also find lead (the actual bullet part that leaves the barrel of the gun). Chances are, grandpa was not jacketing his bullets in copper. Make sure the primer is out of the cartridge (although a few yards will take them). Be very careful though, you may find a live primer in an otherwise empty shell.
Expect dirty brass price if you decide to sell to a yard. You'll do better though by going to your local gun range and letting them know you have empties for sale.
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