Acme Realers are actually opalescent patches. they look just like peerless patches, but are on muddy-type/opalescent base glass. they're very easy to confuse with Akro moss agates and MM cloudies, so if possible, you should try to get a "known" example.The black ones are the easiest to positively ID because no one else makes black patches (that i know of). the black often has an orange peel texture and almost always has aventurine. The base glass should have a swirling motion going on inside, and when you back-light it, it will appear almost completely transparent. Moss agates and cloudiness won't do this. again though, it's important to have one to compare to.