Colour is a very important factor of visual sonority and the main optical effect in painting. The artist is invoking it dually, in a passive way, as an adventure, and in active way as a medium of expression. In both cases the crucial elements are personal sensibility, colour symbolism and a choice of technique.Water is «materia prima», the source of life, a cleasing tool. Frozen water produces a crystal, that attracts with its poetic transparency. With light and refraction, using oil as a medium on various types of paper, I achieve transparency.