Next, introduce the second group of color words. Unlike the first group, these colors do not have an い at the end of the word, and cannot be used as an adjective. Some of these words have katakana equivalents, which are close to the English words. Choose which form you would prefer your students to use. Start in the same fashion as the first group of color words: write them on the blackboard, show the stroke order of the kanji, and use colored flashcards.
緑 (みどり): (midori) Green
グリーン: (guriin) Green
灰色 (はいいろ): (haiiro) Gray
グレー: (guree) Gray
ピンク: (pinku) Pink
銀色 (ぎんいろ): (giniro) Silver
シルバー: (shirubaa) Silver
紫 (むらさき): (murasaki) Purple
水色 (みずいろ): (mizuiro) Light Blue
金色 (きんいろ): (kiniro) Gold
ゴールド: (goorudo) Gold
Since these color words are nouns, they use の to qualify another noun. Write some examples on the blackboard of how to use these words:
緑 の かばん (midori no kaban) Green purse
この はな は ピンク です (kono hana wa pinku desu) This flower is pink
Pass out a second group of flashcards and ask the students to write out sentences. After checking if they understand how to use these words in a sentence, shuffle the two groups together and see if they can pick out the usage differences.