Though often related to food, 'concoction' can describe any creative mixture - not meant for eating. She used a concoction of household chemicals to clean the stain.
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Experimental Nature
'Concoction' suggests experimentation and the result could be unusual or surprising. Clara is famous for her unusual concoctions in the kitchen.
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Hint of Disapproval
Sometimes used to suggest that a mix is odd, risky, or not traditionally combined. His latest concoction of fashion trends looked bizarre.