These crystals will absorb essential oil, or oil based fragrance, oil based color
and glycerin. They will retain the fragrance for up to six weeks depending on
the temperature and air exposure. They can be heated in a potpourri dish
(for strong fragrance throw) or left at room temperture to gently fragrance a room.
Making Salt Crystal Potpourri is a simple process. The main decision is the coloring
of the crystals. There are four different methods for coloring:

Liquid Based ~ This coloring will dry the best
Glycerin Based ~ This will give the crystals a translucent color
Mica Powder ~ Gives the salt an opalescent color
Water Rinsed ~ Gives the salt crystals a "glass like" appearance
Liquid or glycerin colorant fragrance can be hand applied to the
crystals using rubber gloves. Apply fragrance and color. Lay
crystals out on parchment to dry.

If you use mica powder you need to shake the crystal in a plastic bag and then
mist with your fragrance or essential oil.

Water Rinsed - Simply rinse the crystals and let dry for a "glass like" appearance
and then mist with your fragrance or essential oil.
Note: If the fragrance throw weakens before six weeks...shake the crystals in a
zip lock bag vigerously for 20 to 30 seconds.