Reichenbach Lilac - a dense, opaque purple that immediately had me thinking of how it would compare to Effetre EDP.
From the left, Lilac, with EDP dots, Lilac with Ivory Dots, and self-coloured Lilac.
You can see the Ivory has reacted very strongly with the Lilac.
Here a closer look at the EDP dots - the colour of the Lilac is not quite the same, but it showed absolutely no inclination to devit, like the EDP does. The EDP did do an interesting little separation thing though - sorry about the reflections - makes it a bit hard to see.