I have seen a couple of 'practically' solid working ESS. Around 12 or so years ago when I had Connie (working ESS) we were on an invited Mock Trial, and one of the bitches there was to all intents and purposes a solid liver colour....her docked tail was quite long to leave the tiniest tuft of white at the end and her muzzle was heavily roaned. She did have the tiniest whisps of white dotted over her body, strands of hair rather that blocked, so when wet she looked completely solid.....a few years later she also produced a litter of 'normal' (tic) liver and white markings but one pup was nearly solid, with just a whisp of white on the tail, that when the tail was docked, she lost the white marking....again her muzzle and flash were heavily roaned..
>usually the working type ones are the whitest ones! ..
that was my Megan :) Only her head had the most beautiful liver markings and a smattering of liver down one side....if she was sitting a certain way, she looked pure white