We tested four different green food dyes, including pandan powder, matcha, spinach powder, and spirulina powder. To determine which natural dye had the best flavor and color, we ran three tests: We ...

These plant-based colorings do a nifty job of turning your food green—just in time for St. Patrick's Day. We tested four different green food dyes, including pandan powder, matcha, spinach powder, and ...