The most important part of a fine brush is the hair. When we look at a hair, we observe the "body" which goes of the "root" to the sharp extremity called the "flower". It is her(it) who(which) determines the sharpness(delicacy) of a brush, she has to remain intact and never be cut.
Before beginning the manufacturing of brushes, all the hairs of a "boot" have to be able level on the flower. We use machines to vibrate: the hair is placed in metallic circles next size down from which patches rise and come down(fall) very quickly. To help certain hairs to slide, we sprinkle them with plaster.
Then the hair is inserted into a first mould in completely thick and flat cylindrical brass which we quickly type a marble plate " to lower(to go down) the hair " on the flower. The hair is then ready for the manufacturing of the square-ended brushes. For the convex or sharp brushes, we use the second mould, completely spray-painted. Once the lowered(gone down) hair, one him(it)