Howdy all. A friend who is new to leather work made a sword sheath for me. Structurally he did a fair job, bu after dying it there are specs on the leather that didn't seem to take the dye. It was a beige leather to begin with, he dyed it a light brown. It left about 5 small white areas on the sheath, is there a way to fix this? Appreciate you all, thanks. '