We all know that no two coins are created/aged equal. This is especially true with copper cents. I can understand the red (RD) and brown (BN) designations. But I hate the spread in what qualifies as red-brown (RB). PCGS will designate a copper cent RB if it has 5% to 95% original (well that's probably debatable) red. Of course if one looks at auction prices, coins with 95% red sell at a higher premium than one designated as 5% red. That's one of the flaws with prices guides to mention an example. I just don't understand why the mixed red-brown designation couldn't have been better defined. For example, 5% to 50% brown-red (BR) and 50% to 95% red-brown (RB). Of course, if slabbed coins tone in their holders, which they do, the designations may be meaningless over time. I've seen some brown cents designated as red in older holders which probably toned in time inside the holder. So maybe this issue really isn't one.