bottom board, propolis or comb or ?

[Understudy]

So what is that on the bottom board?

I got this picture from one of the members of my association.

Sincerely,
Brendhan

[Brian D. Bray]

Well I see some propolized invaders (large globs), clumps of wax/honey droppings, and the prints from "muddy" feet.  In otherwords, a normal solid bottom board.

[Understudy]

That was my thinking also but I wanted to get some extra opinions just to be sure.  Thank you.

Sincerely,
Brendhan

[Michael Bush]

I always figured propolis, but then propolis often has wax mixed in...