I am looking for a powdery, dry medium similar to a chalk pencil. However I notice that not all chalk pencils are pure white and often exhibit a yellowy tinge. I have seen "white charcoal" products advertised, but I believe these are a patented synthetic material?
Background: I would like to add pure white highlights to studio marker illustrations, & charcoal illustrations on toned paper. I would like a non waxy/oily pencil that can be smudged/blended like charcoal. The last pencil I tried was a Stabilo Carbothello white chalk pencil.
Are there any pencils similar to chalk that are pure white?