This is a single kanji with an い on the end, meaning you know it's probably an adjective. What's the adjective form of black? It's also black. Special Note: The noun version of black also exists in Japanese. It is just 黒 with the same pronunciation, but minus the い which makes it adjective-tastic.
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you:
Think of black things. One very common black thing is the common crow (くろ). Associate those two together.
A black pen, please.
I'm thinking of going to the party tonight in a black dress.
Since our pet dog's fur is black, we do not have any white wool sweaters.