According to "The Armorsite" (http://www.fprado.com/armorsite/main.html):

"The first Tigers issued to front line units during mid-1942 were delivered in overall Dark Grey (RAL 7027). In the Winter of 1942-43, washable White paint was used as camouflage in snow-covered areas. The Tigers of sPzAbt.501 , which deployed to Africa during late 1942, were camouflaged in Desert Brown (RAL 8020) and while Dark Gray was authorized to be used as a second color in a disruptive camouflage pattern, there is no evidence that sPzAbt.501 ever painted their vehicles in this manner. In the more temperate climate of coastal Tunisia, many of the tanks of sPzAbt.501 were oversprayed with Olive Green (RAL 7008) to enhance their camouflage.

Tigers of sPzAbt.504 were camouflaged in overall Brown (RAL 8020) oversprayed with Olive Green (RAL 7008). It is not known if any Tigers went to North Africa painted in Dark Yellow (also known as Wehrmacht Olive), which was specified for use as an overall basecoat on all combat and front line support vehicles during 1943."