When I see them they are dark. Like dark brown, maybe stained from being inside me for so long.
I have seen the occasional red tomato looking things but only see them once in a while.
I don't recall any white or grey but maybe they were grey and turned brown from age and being in me for years.
I am still thinking about Prazi (the tablets for humans) but I am nervous. These flukes have been in me for over 20 years, they must go and the herbs were way to slow and painful. Caused me all types of problems. :-(