TEXTURE

Texture It´s the visual and tactile quallity of the surface due to the material.
Tactile Are thouse that can be percived through the sense of touch
Visual Touse that can be only be percived through the sense of the sight
Natural Those that can be found in nature
Artificial Those created by the human beging manually or mecanically
Rubbing techique It consist or frictianing or rubbing a crayon or colored pencil on a thin paper wich over a surface with a tactile texture so the texture gets copied on a paper.
Scratchboarding It´s usually done with waxed colors and it consist on giving two coats of color the media beging the second one draker. so when scratching over the first.