There is no standard color. The ark is always just a box or chest in which the scrolls of the Torah can be stored standing upright, with the weight on the sticks on which they are wound. Because the Torah scrolls are valuable and because the Torah is sacred text, the ark is typically ornate. Most of the arks I have seen have been fine woodwork, varnished so the color of the wood predominates. Some arks I have seen are painted white, blue or polychrome, even gilt with gold trim. The style is generally that of the fine cabinetwork of the era when the ark was built.
Perhaps you're referring to the 'ark'. The ark is where the Torah scrolls are stored.
The Torah is usually housed in a cabinet, called a holy ark, or "Aron ha-Kodesh".
The Torah is located on the East Wall of the Ark of the Covenant, facing Jerusalem.
The ark is used for holding Sifrei Torah, the scroll held sacred by the Jews.
The Ark has no furniture, just holders for the Torah scrolls.
The Holy Ark is the place where the Torah scrolls are kept.
The Torah is kept in the ark, a box or house for the Torah scrolls. The ark is usually behind or near the bima ("stage") where the rabbi, cantor, and readers stand.
It is where the Torah scroll is kept.
The Torah scroll.
Torah scrolls
To hold the Torah scroll in the synagogue.
the Torah- a scroll that tells the Jewish teachings