Butterfly pea petals were air-dried in the
shade and ground into a fine powder. The
powder was gradually dissolved in distilled
water at a ratio 1:10 at room temperature. The
crude extract was collected by initially filtering
with gauzes and subsequently with No. 1
Whatman grade filter papers (Whatman,
1001-150). The pH of the crude extract was
measured using a CyberScan 1000 pH meter