I'm posting below a comparative essay involving var. caerulea a variety also known out there as var. werkhauseri, or even var. ardosia (slate). The first photo shows two caerulea clones side by side. In one end (left) the color is an impressive bluish gray and in the other end (right) a grayish blue (sorry my poor English! these are the best words I can use to express those colors). More color on the second lip and it turns into roxo-violeta, a separate variety. The second photo shows the two caerulea clones in detail. The thir photo shows them along with the var. roxo-violet for a comparison and the fourth photo puts side by side one of the caeruleas and a tipo.