; ;

No, they aren't tears, although on the Interwebs you may see people cry with semicolons. How to use these? Well, semicolons separate two complete sentences, usually that have to do with the same thing.

The cat was white; not even a speck of gray or black on the critter.

That's the right way to do it.

Using a semicolon as a comma is common, but not correct usage. For example:

The can was white; gray and black, with a long tail.

That is not the way to use a semicolon.