TABLE 1.

Yields and pH determined in dH₂O of dye extracts of calyces of Hibiscus sabdariffa

Temperature and extraction solvent	Dye extract yield (mg) per 5 g of dried calyces	% yield of dye extracts	pH (1 mg/ml)
CM	1,407.2	28.14	2.85
HM	1,554.4	31.09	2.86
CMA	1,281	25.62	2.76
HMA	1,402.5	28.05	2.76
CW	1,775.8	35.52	3.0
HW	1,987	39.74	3.05
BW	1,514	30.28	3.11

Abbreviations: BW, boiling distilled water dye extract; CM, cold methanol dye extract; CMA, cold acidified methanol dye extract; CW, cold distilled water dye extract; HM, hot methanol dye extract; HMA hot acidified methanol dye extract; HW, hot distilled water dye extract.