Are you positive it is pollen? My bees frequently collect powders and granular substances that are not pollen in late winter / early spring. Usually mine collect poultry feed dust and tree bud husks, but occaisionslly they collect random unidentified debris.
If you can, grab a pellet or two and look at the grains under a microscope.
Many a tulip varieties have black polen.
Tulip flowers are also the ones that bloom in early spring, often in sheltered south facing locations. If growing against the south facing wall of a house they will bloom when snow still covers the ground.
I will have to grab some when it turns warm again. I am not near any feedlot sources but could be many other things. Tulips could be possible. It could even be a very dark purple- again I'll collect some when it warms. They were bringing more in today.
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