@bios I do remember we called it a "rainbow stylo" when it was given to me.....the stylo was a guess based mostly on the polyps, but it did have kind of a multicolor hue. The only variety I see now in its color is the "stems" in some areas turn light metallic green sometimes. This is infrequent though.
Hi Mc DEPENDS on light you give it ,not too much,
I also use actinic blue and royal