What is that which obscures without effacing; a stain; a blot, as upon paper or other substance. As for those who cleanse blurs with blotted fingers, they make it worse. Fuller called?

blur — That which obscures without effacing; a stain; a blot, as upon paper or other substance. As for those who cleanse blurs with blotted fingers, they make it worse. Fuller. (Webster's 1913.)