There are no usual colours that I can think of that have 4 syllables. However, there are a few with 4 syllables when they are descriptive of a colour. Some of these are Indian red, Amaranth pink and alloy orange. See the related link for a list of colours.
Co-lour has two syllables.
Optimistic has 4 syllables.
4 syllables
There are 4 syllables in the word especially.
It has 4 syllables. Con-tin-u-ing.
4 syllables am- phi- bi- an
as·tron·o·myThus, there are4 4 syllables in astronomy.4 syllables.
Syllables In TemperatureThere are 4 syllables in temperature. It is divided like this: tem-per-a-ture
There are 4 syllables in "Stationary". Stationary (Stay-Shun-air-ee) 4 syllables
There are four syllables. Tech-nol-o-gy.
4 syllables
there are 4 syllables