I tried 10 different ways to naturally color lotion.
I’m often asked about different ways to naturally colour lotions, so I conducted a fifteen-week experiment testing out ten different natural colourants to see what worked, and what didn’t.
Post Overview
Why ‘lotions’ specifically?
Formulations that contain water—like lotions—are a lot harder to colour naturally than anhydrous formulations (formulations without water). Because water is present, the emulsions are susceptible to microbial spoilage, which is something we don’t have to worry about with products like balms, salves, and anhydrous body butters. This spoilage potential can limit our colourant options as colourful ingredients can also be challenging to preserve. I’ve also found that natural colourants can fade and oxidize much faster in hydrous formulations than anhydrous ones.
Experiment questions
- How do ten different natural ingredients perform as colourants for an emulsion at 1%?
- How does the inclusion of a chelator (Tetrasodium Glutamate Diacetate at 0.5%) change that performance?
Experiment overview
I began by making two big batches of my Easy Natural Lotion for Beginners. Each batch was short 1% to allow room for adding different colourants. One batch was made as written, and one batch included 0.5% Tetrasodium Glutamate Diacetate—a natural chelator. The pH of each lotion was around 5.4–5.5.
I portioned out 29.7g lotion into glass prep cups and added 0.3g colourant ingredient to each: 99% lotion + 1% colourant ingredient.
Each colourant was added to a chelator’d and non-chelator’d portion of lotion, hand whisked to combine, and then decanted into a labelled plastic condiment cup. This resulted in 20 little cups of coloured lotion + 1 wee cup of control (the emulsion without a chelator).
I then left those wee cups in a box on a shelf in my studio for 15 weeks to see what happened.
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The colourants
I tested 10 different natural ingredients, choosing ones that would impart some colour, and generally trying to test ingredients that are somewhat readily available and/or I’m asked about often.
- Activated charcoal
- Alkanet root powder
- Australian pink clay
- Black goji extract
- Carmine (ground powder)
- Coloured mica (Coho Shimmer)
- Hibiscus powder
- Indigo powder
- Sea Buckthorn fruit oil
- Turmeric liquid extract
Several of these colourant ingredients definitely would’ve fared better with a different usage rate or if turned into some sort of an infusion first, but I wanted to 1) keep the experiment as consistent as possible and 2) try a variety of ingredients and formats. I’m also frequently asked about adding powdered botanicals to formulations as colourants, so I wanted to show what happens when you do.
Click the images to enlarge.
Activated charcoal
Alkanet root powder
Australian pink clay
Black goji extract
Carmine
Coloured mica (Coho Shimmer)
Hibiscus powder
Indigo powder
Sea Buckthorn fruit oil
Turmeric extract
The results
The control
The control emulsion remained stable throughout the 15 weeks.
The control in front of the experiments.
To chelator or not to chelator? 🤔
Across the experiment, all of the non-chelator mixtures show some degree of separation at the bottom of the cup after 15 weeks while the chelator versions were stable. As chelators boost preservative performance, I believe this is likely due to the non-chelator version starting to spoil.
Activated charcoal
Activated charcoal is an insoluble fine black powder; at 1% it gave the emulsion a speckled dark grey appearance.
After 15 weeks the the colour appears to have remained stable for both versions, but the non-chelator version is separating at the bottom.
Activated charcoal: experiment start
Activated charcoal: after 15 weeks
The colour appears the same after 15 weeks. Version with the chelator is on the right.
Activated charcoal: after 15 weeks
The colour appears to be the same between the chelator and non-chelator versions.
Activated charcoal: after 15 weeks
This is the version without a chelator; you can see it has split.
Alkanet root powder
I’ve used alkanet root powder in soap, body butter, and lip balm in the past. Its colour shifts with pH: “The colour is red at pH 6.1, purple at 8.8 and blue at pH 10.” (source)
From past experience with this ingredient, I think it would’ve created a more uniform final product if I’d infused it into the oil phase and strained it out rather than adding the straight powder to the lotion.
Adding 1% of the powder to the lotion created a slightly pink, speckled appearance.
After 15 weeks the colour has darkened, with the chelator version being darker than the non-chelator version. I suspect the darkening is due to the powder having more time to infuse the lotion as the colour appears more saturated. The non-chelator version has noticeable splitting at the bottom.
Alkanet root powder at the start of the experiment
Alkanet root powder at 15 weeks.
No chelator on the left, chelator on the right.
Alkanet root powder at 15 weeks.
Both versions are darker than week 1; the version with the chelator is slightly darker.
Alkanet root powder at 15 weeks.
The version without the chelator has split.
Australian pink clay
This is a soft clay with an earth-toned pink colour. Mine was purchased from New Directions Aromatics Canada, but they’ve since discontinued it. The pink colour comes from naturally occurring red iron oxide.
At 1% this clay gave the lotion a soft dusty pink colour. After 15 weeks the colour in both lotions had deepened a bit and taken on a whisper of a brown tint. The version without the chelator showed noticeable separation at the bottom.
Australian pink clay at the start of the experiment.
Australian pink clay at 15 weeks
No chelator on the left, chelator on the right. They seem a wee bit more brown.
Australian pink clay at 15 weeks
I think the version with the chelator is ever-so-slightly pinker.
Australian pink clay at 15 weeks
The version without the chelator has split.
Black goji extract
This dark brown extract is from Voyageur Soap and Candle Co. with an INCI of “Lycium Ruthenicum Fruit Extract (and) Propanediol“.
Despite the deep colour of the extract in the bottle, this at 1% extract just took the lotion from white to a slightly warm white.
After 15 weeks the colour appears to have remained stable, and there isn’t a noticeable difference colour between the chelator and non-chelator version. The version without the chelator showed noticeable separation at the bottom.
Black goji extract at experiment start.
Black goji extract at 15 weeks
No chelator on the left, chelator on the right. Colour appears the same.
Black goji extract at 15 weeks
No noticeable colour difference between the versions.
Black goji extract at 15 weeks
The version without a chelator has split.
Carmine (ground powder)
Carmine is a natural vibrant red-pink colourant that has been used for centuries. It’s made from the cochineal insect, making this the only non-vegan ingredient in this experiment.
I used the powdered version knowing it would be way too much for a lotion at 1%, and I was right—it ended up being more of a sorta-cream-blush than a lotion 😂
The lotions coloured with carmine were bright pink and speckled; I suspect the speckles could be avoided by using about 1/10th of the amount and pre-dispersing the carmine in a smaller amount of liquid earlier in the making process.
After 15 weeks both the chelator and non-chelator version were still vibrant, but I think the one with the chelator was a bit richer/deeper. The version without the chelator showed slight signs of separation at the bottom.
Carmine at experiment start.
SO PINK.
Carmine at 15 weeks
No chelator on the left, chelator on the right. Colour appears to be pretty stable.
Carmine at 15 weeks
I think the version with the chelator is slightly darker.
Carmine at 15 weeks
The one without the chelator has split very noticeably.
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Coloured mica (Coho Shimmer)
The mica I used for this experiment was a lovely pink colour, made from a blend of mica, red iron oxide, and titanium dioxide—all insoluble ingredients. Coloured micas can be coloured with all kinds of ingredients, including synthetic dyes and carmine, so be sure you’re checking the ingredient lists for your micas so you know what you’re using.
At 1% this mica gave the lotion a bright, even colour that was true to the dry mica. It remained stable throughout the 15 weeks, and I couldn’t see a difference between the version with and without the chelator. There was no splitting.
Coloured mica at experiment start.
Coloured mica at 15 weeks
No chelator on the left, chelator on the right. Colour appears stable.
Coloured mica at 15 weeks
No noticeable difference between chelator and no chelator; no splitting.
Mica at 15 weeks
The one without the chelator has split very noticeably.
Hibiscus powder
I used a relatively fine hibiscus powder that gave the lotion a grey-ish pinky/purple colour with lots of speckles. This ingredient almost certainly would’ve worked better as a colourant if infused into something and then strained out, but I included it as a powder as I have been asked about using hibiscus powder as a colourant before.
After 15 weeks the colour had faded. The version without the chelator was a greyish brown and showed noticeable separation at the bottom. The version with the chelator was more of a warm brown and was not separating.
Hibiscus powder at experiment start
Hibiscus powder at 15 weeks
No chelator on the left, chelator on the right. Both have shifted from pinkish purple to brown.
Hibiscus powder at 15 weeks
The one with the chelator is slightly warmer, the one without is slightly more grey.
Hibiscus powder at 15 weeks
The one without the chelator has split very noticeably.
Indigo powder
I purchased indigo powder for use in soap making, but it’s such a beautiful colour I figured I’d give it a try here! As you might’ve guessed from its name, it is a rich, dark blue.
It coloured the lotion a lovely grey-ish blue with some speckles; this is another ingredient that almost certainly would’ve performed better as an infusion.
After 15 weeks the colour appears to have remained stable, and there isn’t a noticeable difference between the chelator and non-chelator version, with no splitting.
Indigo powder at experiment start
Indigo powder at 15 weeks
No chelator on the left, chelator on the right. Colour appears stable.
Indigo powder at 15 weeks
The one with the chelator might be *slightly* darker?
Indigo powder at 15 weeks
No splitting in the version without a chelator.
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Sea Buckthorn fruit oil
Sea buckthorn fruit oil is a deep orange-y red; I chose the deep red fruit oil instead of the paler orange seed oil as it packs a much strong colour punch.
It gave the lotion a soft orange colour. After 15 weeks the colour appears to have remained stable, and there isn’t a noticeable difference between the chelator and non-chelator version, with very slight signs of splitting in the non-chelator one.
Sea Buckthorn fruit oil at experiment start
Sea Buckthorn fruit oil at 15 weeks
No chelator on the left, chelator on the right. Colour appears stable.
Sea Buckthorn fruit oil at 15 weeks
I think the one with the chelator is slightly more saturated?
Sea Buckthorn fruit oil at 15 weeks
Very faint signs of separation at the bottom.
Turmeric extract
The turmeric extract I used for this experiment is from Voyageur Soap and Candle Co. with an INCI of “Curcuma Longa Root Extract (and) Propanediol“. It’s a deep orangey yellow, and imparted a bright yellow colour to the lotion that reminded me of Easter.
After 15 weeks the colour appears to have remained stable, and there isn’t a noticeable colour difference between the chelator and non-chelator version, but there is some slight separation at the bottom of the non-chelator one.
Turmeric extract at experiment start
It’s the yellow one off to the right.
Turmeric extract at 15 weeks
No chelator on the left, chelator on the right.
Turmeric extract at 15 weeks
Colour appears stable.
Turmeric at 15 weeks
The one without the chelator has split very noticeably.
Conclusions & takeaways
- It’s a good idea to include a chelator with this formulation/preservative (Euxyl™ k 903) if you’re including any extracts or botanicals as many of these additions seemed to overwhelm the natural preservative when a chelator was not included.
- It would be interesting to replicate this experiment with a version of the lotion preserved with Liquid Germall™ Plus as I’m much more familiar with that preservative, and I suspect it’s stronger than the Euxyl™ k 903 I used in this formulation. Would we still need a chelator? Hmmm.
- Try infusing botanicals into a medium like oil, water, or glycerin rather than adding straight powdered plants. This will likely give a result closer to what we saw with the Black Goji extract, meaning you’d probably need to use more than 1% to get a noticeable colour in the finished emulsion.
- Coloured micas are a really easy way to reliably colour formulations.
- Indigo and alkanet look like promising botanical/herbal options, but would likely be better utilized as an infusion.
Gifting Disclosure
The Coho Shimmer mica, black goji extract, and turmeric extract were gifted by Voyageur Soap & Candle.
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