Black
い adjective
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.
くろい
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.
その上の、黒いぼう子をとってください。
Can you get me the black hat up there?
あの黒ひげの男ははら黒いことで有名です。
That man with the black goatee is notorious for being black-hearted.
私の一番好きなテレビ番組は、「黒い画面」です。この番組は、停電になった時だけ放送されます。
My favorite channel on TV is called "Black Screen." It only airs when the power goes off.