The first few flushes I did, I didn't know about the tan ones, so I'm not sure if they were there because I only counted the green ones. However, since then, I have had several that are about half and half--lots of tan, mostly chaff sized. The last two flushes, though have had very little of the tan ones and mostly green and now some darker green ones. I'd love it if the tan ones were from the gall bladder, since I might be getting close to empty of them--Let me know if you find out any more info!