| colloidal gold |
Colloidal gold, or more precisely gold nanoparticles are sub-micrometre sized particles of gold, usually found in the form of a suspension in water (hence "colloid"), in which case the liquid usually appears to be either an intense red colour (for particles less than 100 nm), or a dirty yellowish colour (for larger particles). ...
출처: en.wikipedia.org/wiki/Colloidal_gold
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