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Sender described home reagent tests: 'Tested with reagents and it came back all messed up...'.
(photo from Reddit thread republished below)
The 'blank' (handwritten 'Blk') comparison set just shows the base appearance of reagent drops alone, with no chemicals for the reagents to react to. This allows one to see the color of the reagent by itself, and how the Mandelin reagent is normally greenish-yellow without reacting to anything but air.