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I have a couple of them but unfortunately it's hard to get an idea what the color really looks like from a picture. I's more of a splash on a lavender base.
That is a pretty good description, but I would not say blue is replaced by lavender. Perhaps Tim can chime in on what is going on at a cellular level, but from a general genetics mechancis level, both lavender and blue dilute black pigment. (Lavender also dilutes red pigment; blue does not.) Perhaps it can be looked at as adding both chlorine and oxygen bleach to a load of laundry. (Ignoring that oxygen bleach doesn't affect colours much--maybe someone has a better "bleaching agent" to suggest, lol)