🎨 Why does 빨갛다 turn into 빨개요 and 빨간?
These five colours are
ㅎ-irregular. The ㅎ disappears when an ending is added.
빨갛다 → 빨개요 → 빨간 우산
dictionary form · when you say it · before a noun
빨갛 + 아요 → 빨개요 (the ㅎ drops, 아 becomes 애)
빨갛 + 은 → 빨간 (the ㅎ drops, ㄴ attaches)
Same pattern: 파랗다 → 파래요 → 파란 · 노랗다 → 노래요 → 노란
하얗다 → 하얘요 → 하얀 · 까맣다 → 까매요 → 까만
💡 The -색 words above (빨간색, 파란색) are nouns — the colour itself.
These new ones are adjectives — how something is.