In Gbaya, the notion of “very white is emphasized with ndáká-ndáká, an ideophone used to express extreme whiteness, something very white.
Ideophones are a class of sound symbolic words expressing human sensation that are used as literary devices in many African languages. (Source: Philip Noss)
See also very white, teeth are like a flock of ewes, many-colored robes / white, and snow (color).