Where Matcha's Green Color Comes From

Matcha looks greener than a cup of brewed sencha. Same plant, so why the gap?

The pigment is chlorophyll

Leaf green comes from chlorophyll, the pigment plants use for photosynthesis. Tea leaves have plenty of it.

When you brew sencha, you steep the leaves and throw them away. Only some pigment dissolves into the liquid, so the color stays pale.

Matcha is different. The leaf is ground into powder and mixed straight into water. The particles carrying that chlorophyll stay suspended in the cup. Technically it is not dissolved — it is a suspension of very fine particles, which is also why it settles if you let it sit.

Shade makes the green deeper

Shaded cultivation covers the tea field while new shoots develop. The main purpose is flavor: sunlight converts L-theanine, the savory amino acid, into astringent catechins, and covering the plants slows that.

But shading affects color too. With less light available, the plant produces more chlorophyll to make the most of what it gets. Leaves grown under cover end up a deeper green.

This is why Uji has long produced tencha, the leaf behind matcha, along with gyokuro. From April into May, covers hide the bushes completely.

The color is a result of how the plant was grown, not just which cultivar it is.

Color fades over time

Chlorophyll breaks down under light, heat, and air, shifting toward yellow and brown. That is why an opened tin of matcha gradually looks duller.

Powder has far more surface area than whole leaf, so this happens faster. Three things help:

• Keep it away from light — an opaque container, or the bag inside a box
• Keep it cool — not above the stove, not on a sunny windowsill
• Keep air out — close it properly after each use

A shift in color does not mean the powder is unsafe. But color is a reasonable proxy for freshness, and it costs nothing to notice.

Sweetened versions look paler

Because sugar takes up part of the volume, sweetened matcha is a lighter green than pure matcha.

Products vary widely, and not only because of the blend ratio. Some use coloring agents to keep the shade stable, since the natural pigment fades. That means you cannot judge quality by how green something looks.

The ingredient list is more useful. It is ordered by weight, and it will tell you whether coloring has been added.