Cut and Weigh the Melt and Pour Soap Base Place the glass measuring cup on the scale and zero out the weight. Cut the melt and pour soap base into small chunks and place them into the container until you've got the amount that your mold will hold. A few tenths of an ounce under or over will not matter. Tip Make sure that your knife, ​container, and cutting board are clean and free of any dirt. The soap will pick it up and it will be hard to get out. David Fisher / The Spruce

Melt the Soap Base in the Microwave Cover the container with plastic wrap. This will help keep the soap base from drying out as it is being heated. Heat the soap in the microwave, starting with just a minute at a time. Remove the soap and stir it. (It will be thick and chunky.) Repeat heating the soap base a minute or so at a time until all the chunks are gone, and the soap is completely melted. These two pounds of soap base took about four minutes to melt completely, but your soap base and microwave may differ. If you prefer not to use a microwave, the soap base can be melted in a double boiler. Most soap bases will be about 150 degrees when completely melted, so handle with care to avoid any burns. David Fisher / The Spruce

Add Fragrance or Essential Oil While the soap is heating, put your fragrance ramekin onto the scale and zero out the weight. Measure your fragrance or essential oil into the ramekin. A good starting place is 0.4-ounces of fragrance per pound of soap. (Generally, you can use about 2 to 3 percent per weight of the soap.) You can go up or down from there if you're using a light or strong fragrance oil. Plain lavender essential oil at about 0.4-ounce per pound is what was used in this example. (A total of 0.8-ounce for the two-pound batch.) Once you've measured your fragrance and removed the soap from the microwave, slowly add the fragrance to the melted soap base and gently stir. David Fisher / The Spruce

Add Color If you want to add some color to your soap, (you don't have to, it's purely aesthetic,) make sure you use soap/skin-safe dyes, micas or natural colorants. Also, be aware that soap-safe dyes are much weaker than candle dyes. You will need to use more than you would in the same amount of wax. To achieve an indigo color, combine red and blue soap-safe dyes (about 10 drops each). David Fisher / The Spruce

Stir the Melted Soap Gently stir the melted soap to completely incorporate the fragrance and color. Don't stir too hard or you'll get bubbles in the soap. If you do get bubbles, a light spritz of rubbing alcohol from a spray bottle gets rid of them. David Fisher / The Spruce

Pour the Melted, Colored, Fragranced Soap Into the Mold Slowly pour the soap into the mold. Try not to splash the soap and, once again, you want to avoid bubbles if possible. You're done for now. Carefully move the mold to a safe place, cover with plastic wrap, and start cleaning up. The soap should be hard enough to unmold in a few hours. You can hurry this along by putting the mold in the refrigerator, but don't put it into the freezer. It will take several hours on the counter or approximately an hour in the refrigerator for the soap to completely cool and harden. David Fisher / The Spruce