IPA: /əˈkreɪmɪk/
KK: /əˈkreɪmɪk/
This word describes something that has no color or is colorless.
The achromic solution was used in the experiment to avoid any interference from color.
Achromic is formed from "a-" (meaning without) and "chroma" (from Greek χρῶμα, meaning color). The word describes something that is without color or colorless.
Think of 'without' ('a-') and 'color' ('chroma') to remember that achromic means lacking color.