Filbert paintbrush Filbert paintbrush The Filbert paintbrush is a paintbrush used in artwork. It has a thick ferrule and hairs that are, on average, medium to long hairs in the shape of an oval. Filberts are particularly effective in blending work, usually of a figurative nature. Many artists agree that natural fibers work best for filberts because the hairs stick together better when wet. Hairs that can be used are sable, mongoose, bristle, badger and synthetic. Media most likely to have paint applied to by a filbert are oil, acrylic and decorative surfaces. This brush is used on "The Joy of Painting"
5026 Martes well-defined rotation period of 4.4243 hours with a brightness amplitude of 0.69 magnitude (). According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, "Martes" measures 8.967 kilometers in diameter and its surface has an albedo of 0.066, which is typical for carbonaceous asteroids. The "Collaborative Asteroid Lightcurve Link", however, assumes a standard albedo for stony asteroids of 0.20 and consequently calculates a much smaller diameter of 4.93 kilometers, due to the higher albedo. This minor planet was named for the two species of the family Mustelidae, the pine marten and beech marten.