Paprika & Charcoal Swirled Soap Recipe (cold process)

This swirled infused-oil soap recipe draws inspiration from Halloween pumpkins and the flickering fires of Bonfire Night. Create the orange with paprika-infused oil and the black with a generous amount of activated charcoal, then swirl them together. This advanced cold process soapmaking technique includes making two batches of soap at once.

Traditional swirled soap recipes involve making a single batch of soap, splitting it, coloring each part, then mixing them back together. Many use synthetic colorants to achieve vibrant colors, and they can be stunning!

In natural soap recipes, though, we don’t use dyes, micas, oxides, or ultramarines. Some powdered natural soap colorants we do use include clay, charcoal, and indigo, but their range of colors is limited. Especially when you specifically want to create a natural Halloween soap in striking orange and black.

We’ve got one card up our sleeves, though—using infused oils. Some soap colorants, like paprika, can be mixed directly into soap, but the powder can be abrasive in high amounts, and the color fades.

However, if you infuse the powder into a carrier oil, then use the colored oil to make soap, you can achieve vivid, long-lasting colors.

Making infused oil soap recipes is simple for 1-color soap recipes, but what if you want to make swirls or patterns with a second color? I have your back with this recipe! It’s an advanced technique where you make two of the same soap recipes at once—one orange and the other deep black. Then you mix them together to create incredible fire-like soap bars.

Making Swirled Soap Using Infused Oils

The easiest way to make multicolored soap using two or more colors is to use synthetic colorants. You can make a batch of soap, split it into different portions, then mix each with oxides and ultramarines, or use dyes or micas. Pour and swirl them into a mold strategically, and you get some incredible patterns and colors. I’d guess that most vividly colored soap is colored this way.

For a natural option, you could do this, too, but you’re much more limited—especially when you have a color scheme in mind.

Another way to create a 2-color soap is to use embeds in a new batch of soap. You could also grate up a bar of premade orange soap and mix it into a black batch (or vice versa) as a Halloween confetti soap.

The method I’ll show you below is more sophisticated, though, and creates striking colored patterns. To make it, you make a batch of soap using paprika-infused oil and another using activated charcoal. Pouring and then mixing them together creates contrasting bands and patterns.

Getting each batch to trace at the same time and at the same relative temperature is challenging, so I don’t recommend this technique for beginners. Also, the charcoal batch thickens slightly earlier than the paprika, so you will need to be very mindful when making soap. The technique is exciting, but it requires patience, attention to detail, and precise ingredient measurements.

Paprika-infused Oil for Orange Soap

Paprika is the most reliable, vibrant natural soap colorant for orange—at least, as far as I know. Turmeric and annatto seeds can sometimes be used, too, if you use enough and leave the infusion for many months. Both are typically used for various shades of yellow, though. What these colorants have in common, though, is that they give the cleanest, most brilliant soap colors when infused into oil.

Paprika is dried, powdered paprika peppers, and I’ve grown this special type of pepper before. It was fascinating to dry the fruit out in a food dehydrator and then use my immersion blender to turn the dried pieces into powder. Whether you start with homegrown or purchased, infuse about 1/3 cup of dried paprika powder in a quart of olive oil for a month, or use the crock-pot method to infuse it within hours.

At the end of the infusion, you’ll have a bright red-orange oil that you can strain and use in place of plain olive oil in soap recipes.

Use a small portion of the olive oil called for in a recipe with paprika-infused oil to get a light orange-creamsicle hue. Use it at up to 50% of the total soap recipe for a deep pumpkin orange.

Using Charcoal for Naturally Black Soap

Black soap looks incredible, and you can make it with one of a few ingredients. Black mica and black iron oxide are common and accessible, but neither is considered a natural ingredient. The last option, fortunately, is natural: activated charcoal.

It comes as a fine powder, and you typically use up to 1.5 tsp (1/2 TBSP) per pound (454 g) of soap for a deep matte black. You can use more, but you’ll get a light gray lather. In this recipe, we’re going a little wild and using double that amount (1.5 tsp in a 227 g batch) to get solid black swirls. So, you will definitely get a light gray lather from this recipe.

The gray color comes from soap lather that’s loaded with activated charcoal. Though it could look alarming (perfect for Halloween!), it’s used by some as a skin purifier and washes off completely. It can sometimes cause a mess if you leave it sitting at your sink, but don’t worry, it doesn’t stain or make you dirty. You can even find it in some teeth-whitening toothpastes.

Activated charcoal is a powder that you can mix into your soap at any point in the soapmaking process: in the lye solution, in the oils, or mixed at trace.

If you mix the powder in at trace, pre-mix it into a little oil or vegetable glycerine and pour it into the soap using a fine-mesh strainer. This ensures it doesn’t leave clumps in your finished soap bars. In this recipe, we use a lot of activated charcoal to ensure that the black is BLACK-BLACK.

Splitting and Coloring a Soap Batch

Because activated charcoal is so dark, you might think it could cover up other colors. So the most obvious way to use it in this recipe might be to split a single batch of paprika-infused oil soap, color one part, and then mix it together. Unfortunately, the effect didn’t work very well for me.

I tried to make a batch this way, and the result shows how charcoal colors soap. It doesn’t dye it; instead, it disperses as tiny grains in the soap. Up close, you can see orange soap interspersed with black specks. From a normal distance, the overall color effect is a warm gray. This makes sense because I sometimes use activated charcoal with other colorants to create darker hues.

I think that unless you use much more charcoal than recommended, the best way to make natural orange-and-black swirled soap is to make two separate batches at the same time and then swirl them together. That way, the activated charcoal shows up cleanly since the black color doesn’t mix with another color.

Using Infused Oils in Soapmaking

Despite the extra work, I’m excited to know that making two batches of soap at once works well when swirling infused oil soap recipes. My next stop will be making two batches of infused oil soap, maybe deep magenta-pink Himalayan rhubarb soap and a lighter paprika. Or indigo and alfalfa. The combination ideas are endless when you’re working with tried-and-tested botanicals!

Finding and using the right plants, herbs, and spices to make naturally colored soap isn’t easy. Some that you think would work, like beets, leave you with a disappointing brown instead of pink or red. Others, like spinach, tint soap a vivid green only to fade to tan.

Fortunately, I’ve experimented with many different plants in soapmaking over the past fifteen years and have narrowed down the best ones for you.

One of them is paprika, which you’ll use in this infused oil soap recipe. I’ve shared many others in my ebook, Botanical Soapmaking: Oil Infusions for Vibrant, Natural Colors. If you want to start making incredible, naturally colored soap, I recommend getting a copy. Each plant introduced in it will give you long-lasting botanical color in cold-process soap when used in infused oil. Here are more soap recipes to explore:

• Pumpkin Spice Soap Recipe (pumpkin puree)
• Lavender Soap Recipe (purple)
• Gardeners Soap Recipe (green)
• Calendula Soap Recipe (yellow)