What Color Is Green Tea?

Green tea, black tea and oolong all come from the same plant. Color is the easiest place to see the difference. Here’s why green tea is green, what shade the cup should be, and what yellow or brown usually means.

Why is green tea green?

To make green tea, the leaves are steamed or pan fried and then dried, not fermented, according to the National Center for Complementary and Integrative Health. That early heat stops the leaf enzymes that would otherwise oxidize it, which a 2026 review of Japanese green tea says preserves the natural green color. A Cornell study describes green tea as unoxidized. In black tea, those enzymes oxidize the leaf’s catechins into colored compounds called theaflavins and thearubigins, and thearubigins are a major part of black tea’s color.

Green tea gets its color from the leaf’s own pigment, chlorophyll. In a study of Chinese green teas, the authors note that chlorophyll a is blue-green and chlorophyll b is yellow-green. Chlorophyll itself is green, but its breakdown product pheophytin is yellow-brown to dark brown. So the green you see depends on how much chlorophyll survives.

Processing matters here. In a Japanese study of steamed tea shoots, how long the leaves were steamed had the biggest effect on how much chlorophyll turned into pheophytin. The same study notes that shading tea plants is widely used to enhance the green color, and the Japanese green tea review says shading raises chlorophyll content. Matcha is made from shaded leaves that are steamed, dried and ground into powder, and you can read more in how matcha differs from green tea.

What color should brewed green tea be?

There’s no single right shade. In a lab study of cold-brewed green tea, the color depended on the water: clear light green, light green with a yellow tinge, bright yellow-green or, with mineral water, a dull deep yellow. Hot-brewed tea looks different. A study comparing a 4°C cold brew with an 80°C brew found the cold brew pulled out fewer flavonoids and kept more chlorophyll, so it looked greener.

Twinings advises against judging tea by its color, because color shows up before the flavor has fully developed. Taste is the better guide.

Why is my green tea yellow or brown?

• The tea is old or was stored badly. Over time, chlorophyll turns into brown pheophytins, and heat, light and moisture speed this up. A 2026 review of tea storage lists leaf yellowing and a darker cup as typical signs of aging green tea.
• You steeped it too long. In one cold-brew study, the infusion got darker and more yellow-green the longer it steeped, from 4 minutes to 2 hours.
• Your water is hard or mineral-rich. A Cornell study found green tea brewed in tap water looked darker and cloudier than tea brewed in bottled or deionized water. In another study, cold-brewed green tea made with mineral water looked a dull, deep yellow.
• The tea has been sitting. A 2026 study of commercially made green tea drinks found that their color changed more, and their polyphenols dropped, the longer and warmer they were stored. The authors describe this as browning.

If your cups keep coming out dark or harsh, our guide to how to brew green tea covers water, temperature and timing.

Does the color mean the tea is bad?

Mostly, color is a quality clue. Brown leaves and a dark cup suggest older tea, and the storage review links aging to a flatter taste. Cloudy iced tea has a simple cause too: Iowa State Extension says tannins released during steeping make it cloudy.

Color can’t tell you whether tea is safe. For dry leaves, look for mold. The storage review says the risk of mold rises when dried tea takes on too much moisture. For brewed tea, go by time and temperature. Our guide to how long green tea lasts has the limits.

Is “tea green” also a color name?

Yes. Wikipedia’s list of green shades describes tea green as a light green meant to represent brewed green tea, and gives it the hex code #D0F0C0. That’s a design color, and real cups vary.