What am I looking at here?

Pests and Diseases
1

Cleaned off the bottom board 8 hours ago. New beekeeper. Nuc only installed 1 week ago

bottom board 1
bottom board 13024Ɨ4032 1.99 MB
bottomboard2
bottomboard23024Ɨ4032 1.45 MB

2

The large bits are chalk brood mummies. Iā€™m not sure what the blackish gritty stuff is. The lighter colored stuff is most likely brood cappings created while young bees emerge.

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3

The black bits might be mildewed wax. Your hive might need some help with ventilation.

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4

I was thinking the black bits were some sort of frass.

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