I have produced a few pos het clutches, I'm 2 for 2 on picking out pos het hypos so far. In a entire clutch, some will be lighter than the rest, those are more than likely the hets. Now a single animal without a reference, you can't really tell. IMO it's not worth proving out a spider het hypo, compared to a female hypo, It really not that much more to just buy a honeybee.