What is the difference between white and pink ginger?
Although white ginger and red (or pink) ginger do exist, the different colors in sushi ginger are from a dye. The color in white sushi ginger comes from the pickling process and the red/pink color in ink sushi ginger comes from an artificial dye (usually E124 -cochineal red- or in other brands beet extract). The generic name for sushi ginger is gari and here's the Wikipedia page.


White gari/sushi ginger on the left and pink gari/sushi ginger on the right.