Please, don't put the wool mittens into washing machine with Ariel, Persil, Perwoll and others. Wool is like human hair. There are some special liquids for wool cleaning. Wool repels dirt, so it naturally stays on the outside of the fabric and can usually be wiped away.
If you really must wash, use cold water and a mild soap. Lay flat to dry.
Avoid heat as it may remove lanolin from the fibers and can damage the structure, resulting in broken fibers and decreased durability.
Please keep in mind that different computer/mobile/tablet monitors will display a color differently for a variety of reasons. Especially when it's a natural color.