Hóngtōngtōng de wǎnxiá pùmǎn le xībian de tiānkōng.
Red clouds spread across the western sky.
Tips
usage
彤 mostly survives in the reduplicated intensifier 红彤彤 (hóngtōngtōng, 'bright red') and in given names. It is rarely a standalone adjective in modern speech.
memory
The 彡 on the right is the 'bristle/decoration' radical — picture three brush strokes painting something 丹 (丹, cinnabar/red) on the left. Red paint applied with a brush: 彤.
彡 is the 'bristles/ornament' radical, three downward strokes suggesting brush hairs or decorative lines. Here it shows the red being painted or brushed on.