Chinese · Pronunciation Guide
hoong-SUH, rising then falling. The first syllable ends deep in the throat with the ng of "song" and the h is a scrape rather than a breath.
hóngsè
Rise then fall, and no tone changes. The pattern is identical to 蓝色 and 白色, which makes the colour vocabulary unusually consistent tonally: whatever the colour word does, sè always ends the compound with a hard drop. Use that predictable landing to anchor your rhythm.
Listen: 红色
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苹果是红色的。
Píngguǒ shì hóngsè de.
The apple is red.
Listen: 苹果是红色的。
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苹果是红色的。 ends with de, a toneless particle, and that matters more than it looks. After sè falls to the bottom, de adds a short unstressed tail at the same low pitch, so the sentence dies away rather than stopping abruptly. The shì before hóngsè is another sharp fall, so you get drop, rise, drop, nothing — a genuine roller-coaster in four syllables.
The recurring error is treating -ong as the vowel of English "long" — a wide open "ah" plus ng. Mandarin's is much more rounded and closed, nearer "oong". Learners also tend to let the rising tone start too high, so it has nowhere to go; begin around the middle of your speaking range so there is room to climb before sè drops.