How to Get the "Perfect Red" in Cold Process Soap
Getting a bold, true red in cold process soap can feel impossible—so many red micas end up looking pink or dull even after going through gel phase. This can be really frustrating if you’re going for a true red, especially for the holidays and Valentine’s Day. We took matters into our own hands by testing a variety of red colorant blends to help you get that vibrant, fire-engine red each and every time.
Why Red is Tricky in Cold Process Soap
Cold process soap batter is naturally light—white or creamy—so any color added tends to appear pink, muted, or pastel. Adding more colorant into the batter can yield a brighter red, but it often comes with unwanted side effects, like colored lather. The trick is using the right blend of colorants at the right usage rate, and of course forcing gel phase on a heat pad.
Other tips & tricks: When formulating your oil blend for color test batches, avoid using too much olive oil. This is because olive oil tends to add a warm, yellow-ish hue to the final bars regardless of which colorants you use, which will skew the final outcome. Of course some olive oil in your recipe is fine, but we wouldn’t recommend testing colorants using castile soap, for example.
As always, it’s key to evenly and thoroughly disperse your colorants in lightweight oil, like sweet almond oil. We like to use a mini mixer to break up any clumps. If you were to add your colorants directly to the batter in powder form, you risk clumpy, uneven color.
The Experiment & Winners
We tried a dozen combinations of colorants using combinations of Electric Bubble Gum, Merlot Sparkle Mica, Tangerine Wow!, Crimson Mica, and Brick Red Oxide—all dispersed at 1 tsp of powder per tbsp of oil. Many of these combinations did not yield the results we were going for, they were either too brown, too dark or too pink. This left us with a couple of clear winners!
#1 Classic, Bold Red - 2 Parts Tangerine Wow : 1 Part Electric Bubblegum : 1 Part Brick Red
#2 Modern, Cool-Toned Red - 1 Part Electric Bubblegum : 1 Part Red Mica : 1 Part Crimson Red
Both of these “true reds” are beautiful, bold, and saturated. The first winning colorant blend produces a beautiful warm fire-engine red, perfect for holiday soap designs. The second winning blend is a bit more cool-toned, but still produces vibrant results. We used #1 for our Peppermint Swirl Soap Project (see below) and we absolutely love how it turned out!
Conclusion
Finding the perfect red in cold process soap takes a bit of testing, but once you know the tricks—neutral oils, dispersed colorants, and a strong gel phase—it becomes much easier. Start with one of the tried-and-true blends above, then adjust the ratios until you land on a shade that feels perfect for your recipe and style. With a little practice, you’ll be able to create reds that are bold, consistent, and uniquely your own.
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