Pitch
/pɪtʃ/
noun
A sticky, gummy substance secreted by trees; sap.
“It is hard to get this pitch off my hand.”
A dark, extremely viscous material remaining in still after distilling crude oil and tar.
“It was pitch black because there was no moon.”
Pitchstone.
verb
To cover or smear with pitch.
To darken; to blacken; to obscure.