The raw wool is basically white, not dyed with chemicals, but if you check carefully, you will find different colored wools and trash (straw, etc.) mixed in. We try to remove as much as we can during the manufacturing process, but there will inevitably be some left over. Please understand that this is not pure white, but natural white.
By the way, you may think that the white color makes the dirt stand out. However, felted wool is very functional in terms of stain resistance and water repellency, so it will not get dirty easily. If you want to wash it, you can do so with water.