[Wolfman]

My daughter has picked out a Vampire dress that she loves. But it's white silk with an overlay of woollen lace. Very Old School, but it doesn't glow under Black Light. Isn't there some sort of dye available that we can use to cause it to reflect?

 

[Frankie's Girl]

Get a spray bottle and test out your laundry detergent (I like liquid better, but can use powder, or even handwashing liquid like Woolite). You should be able to water it down a little and check it under black light to see if it has phosphorous (most of them do). Do about 1-2 ounces to 16-20 ounces of water. Turn on the blacklight and start spraying down the costume. Allow to air dry and it should be fine.

Or you could get a packet of Rit whitener, but most folks already have laundry detergent in their house, and a spray bottle mixture is the easiest way to apply.