nah, collected it should be a yellow pile.
if you got nothing in the baggie, you got nothing in the baggie
(well maybe a few minute grains)
he's saying it's hard to see.. like just blowing in the wind.
*you know how you never really see pollen blowing around, yet there's a nice yellow pile on the patio eventually. same deal
single grains will be tough to see, but a pile of pollen is obvious.
keep playin. IMO the warnings are harsh, just so you heed them.
it is small, it can go everywhere.. but that's why you segregate, collect, and apply when/where needed/wanted.