Oxalic Acid

In milligrams per 100 grams (3 1/3 ounces)

Tea-steeped 5 min....2.06

Black Pepper...3.25

Sorrel...3.63

Cocoa...4.50

Rhubarb stems...5.00

Swiss chard...6.45

Spinach...8.92

Purslane leaves...9.10

Beet greens...9.16