Why activated carbon absorbs colored particles? Why colour matters?

tsuwal
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Seems a bit odd why colour determines if it is absorved or not, doesn't it? My teacher could not answer this question.
 
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Color doesn't matter, carbon absorbs any molecules. We just do the simple experiments with colored substances as then the change is easy to observe.
 

Thread 'Humidity of a saturated NaCl solution with anticaking additive'

I want to test a humidity sensor with one or more saturated salt solutions. The table salt that I have on hand contains one of two anticaking agents, calcium silicate or sodium aluminosilicate. Will the presence of either of these additives (or iodine for that matter) significantly affect the equilibrium humidity? I searched and all the how-to-do-it guides did not address this question. One research paper I found reported that at 1.5% w/w calcium silicate increased the deliquescent point by...
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