Dirt and Debris
Remove any debris from melt-and-pour soap base by scooping it out with a spoon. Protect your soap base from dirt by storing it inside a container with a tight lid.
Color Changes
Old melt-and-pour soap base can sometimes take a yellow hue, but the soap quality remains. Use colorant (mica) to cover it. Fragrance oils containing vanilla will cause soap to turn brown, but vanilla and color stabilizers are available.
Dried, Crumbly Soap Base
High-quality glycerin soap shouldn't crumble, but over time it can dry out if not tightly sealed. Soap base containing too much lye can cause crumbly soap, so purchase supplies from a respected supplier.
Bonding Layers
To get two soap layers to adhere, spray rubbing alcohol on the first--hardened--layer before pouring the next. Rubbing alcohol bonds the layers.
Boosting Lather
If you want more bubbles from glycerin soap, add castor oil or tallow at no more than 3.5 percent.
Air Bubbles
To remove air bubbles from glycerin soap after pouring into molds, spritz the layer with rubbing alcohol. The bubbles will dissolve.