• 染色せんしょく — dyeing
• 感染かんせん — infection
• 染料せんりょう — dye (substance)
• 染筆せんぴつ — brush with ink
• 汚染おせん — pollution / contamination
• 染そめる — to dye
• 染そまる — to be dyed / influenced

氵 (water) suggests the use of liquid, while the right part 染 represents immersion and spreading. Together, 染 indicates soaking with water or dye, extending to figurative senses like infection and influence.

このシャツを 青あおに 染そめました。
I dyed this shirt blue.

こどもが 悪わるい 影響えいきょうに 染そまるのが 心配しんぱいです。
I’m worried the child might be influenced in a bad way.