The Purple Kale Juice Acid-Base Change Experiment is the process by which anthocyanin reacts with acid and base to change color. Purple kale changes color due to anthocyanins within the cells of the purple kale. Anthocyanin is a water-soluble plant pigment. In a broad sense, it belongs to the flavonoids. It is present in the cytosol within the vesicles.

The color of anthocyanins changes color depending on the pH, with the cytosol being reddish if it is acidic and bluish if it is alkaline.

Morphological Characteristics of Kale

Biennial herb, pinkish frosted. Dwarf and stout annual stems fleshy, unbranched, green or gray-green. Basal leaves numerous, thick, wrapped in layers into a globose, oblate, 10-30 cm or more in diameter, creamy white or light green; biennial stems branched, with cauline leaves. Basal and lower cauline leaves oblong-obovate to orbicular, up to 30 cm long and wide.

Top rounded, base cuspidate into very short broadly winged petiole, margin undulate inconspicuously serrate; upper cauline leaves ovate or oblong-ovate, 8-13.5 centimeters long, 3.5-7 centimeters wide, base amplexicaul; uppermost leaves oblong, ca. 4.5 centimeters long, ca. 1 centimeter wide, amplexicaul.