Based on "grijsbruin" (grey-brown) and "kleurstof" (dye), the most likely answer for a 6-letter word is:
- Grijs (grey) - This directly translates from the first part of the description.
While "grijs" itself isn't a dye, it's a strong possibility in the context of a 6-letter answer for a grey-brown dye.
If you're looking for other options, there might be less common dye names that fit the description, but with only 6 letters it's difficult to say for sure.