Here’s a cheap way to decorate with detergent and a black light for halloween… Tetranitrate writes – “All that is needed is a blacklight and some uv paint. A cheap substitution for the paint is liquid laundry detergent; I used tide with bleach alternative, but almost any kind will do. Laundry detergent glows under UV light because phosphors are added so that when the clothes are in sunlight they appear brighter. A pretty clever/sneaky (depends on how you look at it) trick by the detergent companies. The black light I used is a 30 in. Phillips 20W bulb stuck in a plastic holder that used to hold the light for my fish tank.” – Link.

Related:
Halloween on MAKE! – Link.