Glitch black?

So I was wondering if someone knew how to do the glitch. I heard that it happens when there is sever lagg and your selling an item or I also heard that when you buy a item you won't get like a hour later and it will be 0/0/0

Stopped working a long time ago. They changed it so that items are no longer sent to your mailbox after you buy them. Also, the glitch color is now grey instead of pure black,