The soles turn white (also called blooming) due to the natural character of the Hevea milk, used in making the 100% biodegradable Angel Soles. It’s a quite normal phenomenon linked with this material. After a certain time, the proteins contained in the Hevea milk migrate to the surface and cause a white powder-like substance to sit on the surface of the latex, we call this blooming. You’ll notice this white chalky surface on older angel soles.
To address this issue, our factories that work with these latex soles typically brush them (after the shoes are finished) with a silicone oil & water solution. They do this after the fact because if some of the silicone solution got on the side of the soles that get adhered to the upper, it could mess up the bonding of the cements.
It’s not anything that will hurt or damage your shoes, or your health by any means. If it bothers you, it should wear off as you walk, or you could always wash it off using warm water with just a drop of silicone (yes, that silicone).
