LavaWood,
The scales that you are referring to are Shadetree burlaps. The dark color you are asking about in the various pictures is what Fiddleback Forge calls “Black” and fod (i.e. the owner of Shadetree) calls “Oreo.” It is made from black pigmented resin with white burlap. Depending on the lighting in the photographs, this material can look anywhere from black to bluish purple in color.
All of the Shadetree burlaps are difficult to photograph to capture the true colors. I have found that the best natural colors are taken outside in non-direct sunlight. Inside photos always seem to result in washed-out or distorted colors to me.
Here is a photo to show many of the Shadetree colors. (I don’t have any of the newer Herringbone burlaps to show.)
1st Row L to R: “Ruby” Hiking Buddy, “Evergreen” Patch, “Drunken Burlap” Bushcraft Karda
2nd Row L to R: “Emerald” Bushcrafter, “Black/Oreo” Arete, “Ruby” Bushcrafter, “Sapphire” Kephart
3rd Row L to R: “Sapphire” Camp Nessie, “Emerald” Leuku, “Black/Oreo” Bushcrafter
4th Row L to R: “Electric Orange” Duke, “Coffeebag” Toothpik, “Ruby” Big Sneaky
Good luck with your search. Take it from me, Shadetree burlaps are very addicting.
Phil