Whatman No. 1 filter papers were cut into rectangles of size 14.7 cm × 17.5 cm. Separate papers were treated with each binary mixture formulation using a calibrated micropipette delivering 2.8 mL of solution. Untreated control papers were treated with absolute ethanol only. DEET (2.5% v/v) was used as a gold-standard repellent. The treated papers were placed on a plastic sheet and air-dried at room temperature for at least 1 h before use. Multiple papers in each formulation were discarded after being used once [17 (link),21 (link)].
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