I try to analyse the blue of the bluebells, I realise of course each individual flower is slightly different to its neighbour; but in my mix, I will certainly use a very gd quality ultramarine (finest ), slightest hint of magenta violet, and possibly a smidge of my neutral tone (its definitely not black). Even harder is trying to analyse the smell……………………………………………….!especially when one has just stepped into the bluebell wood after rain.