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DIY: Herbal Soap Making From Scratch

DIY: Herbal Soap Making From Scratch                 

Handcrafting soap from scratch is a mesmerizing and enchanting process.  Watching the transformation of oil and water makes you feel like a scientist, chemist, alchemist, or perhaps an herbal magician. There’s nothing quite like the satisfaction of lathering up with a luscious bar of your own homemade soap, and I’m beyond excited to share this DIY skill with you!

After bathing with your homemade soap, you’ll be hooked. Industrial soap companies remove the glycerin from soap in order to produce bars that are firmer and longer lasting.  Glycerin occurs naturally during the soap making process, providing a moisturizing quality to soap. Since handmade soap retains glycerin, it is gentler and more moisturizing to the skin than conventional store-bought soaps. This is also why handcrafted soap should be placed on a well-draining surface, and not left standing water where it will quickly dissolve.

Is Making Soap Dangerous?

Making soap does need to be done with care and caution because of the lye, but don’t let that scare you away. With proper precautions, it is perfectly safe to make soap at home.  Just make sure that you have a few hours of uninterrupted time, a well-ventilated space, wear gloves and safety goggles, and ensure that no children or pets are present.  Once the soap has finished curing, there will be no residual lye and you’ll have a perfect bar of skin-nurturing soap.

DIY: Herbal Soap Making From Scratch

This is a simple and unscented recipe enriched with nourishing herbs. Calendula, chamomile, and marshmallow provide wonderfully calming, soothing, and healthful qualities — the powders add a light texture and color to the finished bars. Feel free to experiment with other herbs that you like to use for skin care! This recipe will yield a two pound batch of soap which will make approximately ten bars, depending on how large they’re cut.  If you wish to incorporate other ingredients or increase the size of the batch, use a soap making calculator to determine the appropriate amounts of water and lye.  These calculators are available online for free.  If you wish to add a scent, incorporate ½ - 2 ounces of essential oil when the soap is at trace.  The herbs are optional and can be omitted for a pure bar of soap.

DIY Herbal Soap

  • Safety glasses
  • Rubber gloves
  • Scale
  • 2 thermometers
  • Rags and towels for cleaning spills
  • White vinegar for neutralizing lye spills and splashes
  • Large stainless steel pot
  • Glass Pyrex or plastic pitcher for mixing lye and water
  • Wooden, plastic, or stainless steel spoons, a plastic spatula, and other mixing utensils
  • Soap mold – use a wooden box, shoebox, milk carton, silicone mold, or a plastic container.
  • Freezer, parchment paper, or plastic bags to line your mold
  • Electric immersion stick blender – optional, but saves time
  • Newspaper and cardboard to cover your work area
  • Clear plastic food wrap

Important: Reserve a special pot, mixing containers, and other tools especially for soap.  Never use aluminum pots or utensils as they will react with the lye.


Important: Weigh all ingredients on a scale. Soap measurements are done by weight, not by volume.

  1. Gather all materials and clear your work area of any clutter.  Place cardboard and newspapers on the countertops and other work spaces to protect from spills and splashes, keeping the white vinegar nearby.  If possible, wear a long-sleeve shirt, pants, and shoes.
  2. Make a calendula infusion by bringing 16 oz of water to a boil, then remove from the burner, and add the calendula flowers. Place a lid on the pot, and allow it to cool to room temperature. Once completely cool, strain out the flowers and reserve the liquid. You can use water in the recipe instead of this infusion, but calendula increases the healing and soothing properties of the soap.
  3. Line your soap mold with freezer or parchment paper. You may look online for tips, as there are many tutorials and videos available. Plastic or odd shaped containers can be greased with a cooking spray instead of lined.
  4. Pick a well-ventilated area in which to mix the tea and lye in order to minimize your exposure to the fumes. Wear goggles and gloves. Weigh out the calendula infusion, and place into your container. Weigh the lye, then slowly pour it into the container while mixing. Stir until the lye has thoroughly dissolved, while taking care not to inhale the fumes. If the fumes are too strong, leave the area, and return later to finish mixing. It may not be apparent, but the lye and water mixture becomes very hot.

Important:  Always add lye to water, and not the other way around. Adding water to lye may cause a bubbling “volcanic” reaction, increasing the risk of an accident or injury.  If you splash lye onto yourself, immediately flush the area under running water and neutralize with vinegar. Seek medical attention if necessary. Lye will burn skin, and can melt a hole on countertops and other surfaces.

  1. Weigh all solid oils and shea butter in a large stainless steel pot. Melt on the stovetop over a low temperature. Once melted, weigh all liquid oils and add them to the pot.
  2. Watch the temperatures of both preparations. Ideally, they should cool down to the same temperature at the same time.  If they do not cool at the same rate, gently heat or cool the solutions using a hot or cold water bath.
  3. When both solutions reach 90-105 degrees Fahrenheit, it’s time to mix. Wearing goggles and gloves, slowly pour the lye solutions into the stainless steel pot of melted oils while stirring. You’ll notice the mixture getting thicker, and it will begin to smell like soap. Stir until soap reaches the “trace” stage.  This is when the soap leaves a faint mark for a few seconds on the surface of the soap before it sinks in.  This stage is often compared to being a similar consistency to pudding.  Use an electric stick blender to quicken the process, working in short bursts that last for a few seconds each.  Stirring by hand can take 15-60 minutes, while an electric stick blender can reduce this time to 3-10 minutes.
  4. Once the soap reaches the trace stage, add the powdered herbs and stir until incorporated.  If you’d like to add essential oils, this is the time to do it.
  5. Pour soap into mold.  Make sure that it is distributed evenly.  Tap the sides lightly or gently shake in order to remove any air bubbles.
  6. Sprinkle calendula petals and chamomile flowers on top of the soap.  This is optional, but it looks pretty.
  7. Cover mold with plastic food wrap to help prevent soda ash from appearing on the top of your bars.  Soda ash isn’t harmful, but appears as a light white dusting and isn’t desired for cosmetic reasons. Place soap in a warm area, covered with towels or a blanket to help insulate it and retain heat. Leave it undisturbed for 24 hours.  Try not to peek! You want to retain heat in the mold.
  8. What to do with the mess in the kitchen? One trick is to simply place all of the dirty utensils into the large stainless steel pot, and place it on a shelf in the garage, basement, or other out-of-the-way place for 2-3 weeks. The raw soap will be safe within a few weeks, making cleanup a snap! You can certainly clean everything immediately after making soap, but the mixture will still be caustic so proceed with caution. Make sure to clean out the sink, countertops, and anything else that the raw soap touches. It’s good to wear gloves, wiping each surface with vinegar in case in case you missed any residual raw soap.
  9. Check soap after 24 hours. It has most likely gone through a gelling stage which results in the soap becoming hard and it accelerates the curing process. The soap should be firm to the touch, yet will still be a little soft. You can either remove from the mold now, or leave it for another 24 hours depending on how soft it is. You’ll want to cut it when it’s firm to the touch, yet still soft enough to easily slice through.
  10. Remove soap from the mold, and cut into bars or other desired shapes.  Allow the bars to cure for at least 4-6 weeks before using. Cure on metal racks or cardboard, turning the bars daily (or as often as you remember) so that all sides are exposed to air. The curing process hardens the bars and makes them gentler for the skin.


Soap can be made with a variety of carrier oils, essential oils, herbs and spices, and many liquids including coconut milk, coffee, and even beer.  Soapmaking is an obsession waiting to happen, and with all of the options, you’ll never tire of dreaming up new creations. Handmade soaps make wonderful gifts for friends, co-workers, and loved ones. They will be thrilled to receive your wonderful creations, so feel free to soap away to your heart’s content! Have questions? You’re not alone. There is a huge soapmaking community out there! If you need guidance, simply look online and you’ll find a rich community of fellow soapmakers, entire websites, and blogs devoted to soap, tutorials, forums, and videos. There are also many wonderful books on soap making, including Soap Crafting and Pure Soapmaking

Happy Soapmaking!

DIY: Herbal Soap Making From Scratch

Topics: All Recipes, Aromatherapy Recipes


Written by Irene on January 2, 2015

Irene, Customer Experience Director, supervises the daily operations of all our customer-facing activities at Mountain Rose Herbs. She also serves on the board of directors for Eugene-based nonprofit Cascadia Wildlands, protecting our precious outdoors. When she isn’t ensuring your experience aligns with the goals and mission of our company, she can be found taking care of her adorable twin boys, crafting her own line of body care products, and even harvesting wild plants and gardening.