This is just a basic observation - chicken droppings are both poop and urine - the white part is the equivalent of urine, the dark part is the poop. With diarrhea, I would guess there is little urine in the droppings, hence the largely black color.
So maybe they’re dehydrated a little?
Well, it’s not formed at all... just globs of wet looking black poo’s. And quite gross I must say. EWW.
I assumed because the wetness or sliminess was urine mixed in ?????
And here all these years I was told the white part is just more of the dark part...