Soap can be scented in several ways. Fragrance oils are lab-created synthetics that are skin-safe. Synthetic fragrances can smell like anything --from apple pie to fresh laundry. Essential oils are derived from plants, and are more potent than their synthetic counterparts. Essential oils smell like the plants they are derived from. Lavender essential oil smells just like the lavender plant. Essential or fragrance oils can be used to make scented soap, provided the oils are labeled skin-safe.
Use the knife to chop the soap into smaller chunks. Chunks should be relatively uniform and about an inch square.
Place the soap cubes in a microwave-safe bowl. Place the bowl in the microwave and cook on high for one minute. Stir with the spoon. If any unmelted soap remains, microwave it in 30-second increments until it is all melted.
Add fragrance to the melted soap. If you're using a synthetic fragrance oil, add between 2 and 4 tbsps. of it and stir to blend. If you're using an essential oil blend, add 10 to 12 drops and stir to blend.
Pour the scented, melted soap into the molds and allow to cool. Melt-and-pour soap takes about an hour to cool, depending on the size of the mold. Once the soap is cooled. pop it out of the mold. Store or use as desired.
Plastic candy molds work for scented guest soaps. Introduce additives like flower blossoms and colorants, if desired, to the melted soap before pouring.
Melted soap is hot, don't touch it with bare hands. Don't use containers for food once you've used them to make scented soap.