In this week’s blog, we reveal the lotion making process and see why it's worth the effort. If you’re a novice at making lotions and creams or want to get into DIY, read on!
A lotion is an emulsion, a mix between oil and aqueous phases. A lotion is a slightly more runny version of a cream, that is easily absorbed and spreads well. It is light and non-greasy. A lotion is the middle ground between a skin milk and a cream.
To make an emulsion, an emulsifier is used to blend an oil phase and an aqueous phase together so that they don't separate. There are two types of emulsions: the ‘oil-in-water’ (O/W) emulsion when oil is dispersed in the water phase, and the ‘water-in-oil’ (W/O) emulsion where the water phase is dispersed in the oil phase.
O/W emulsions typically contain 10-35% oil phase and are typically lighter day creams and lotions.
W/O emulsions contain 45-80% oil phase and have a heavier, greasier feel; they are generally night creams or extra moisturising body creams for dry skin.
By default, a lotion will be an O/W emulsion. The oil phase will be around 10% and the water phase will be around 70-80%.
Insert: don’t be confused by the percentages, you can simply convert them to grams or milliliters, as a total of 100% can be equivalent to 100ml or 100g, as long as you keep the same units with all ingredients.
So we know a lotion contains oil and water, but let's chat a little about the key ingredient in any emulsion, the emulsifier. An emulsifier has the ability to blend water and oil together, two substances that would otherwise never mix. Emulsifiers come in the form of emulsifying waxes, but other ingredients such as surfactants and thickeners can also have some emulsification properties.
Emulsifiers are used at around 3-8% and are incorporated with the oil phase of the formulation.
For an in-depth understanding of emulsifiers we highly recommend that you read a Quick Guide To Emulsifiers.
The last key ingredient in a lotion is a preservative. Any product containing water will be susceptible to contamination by bacteria, fungi, mold or yeast, so we prevent this by using a broad spectrum preservative such as Geogard 221. Like an emulsifier, a preservative is absolutely necessary to any lotion formulation. Preservatives are used at 1-2% and are added to the cool down phase of formulation.
We highly recommend that you read more on preservatives here: Quick Guide To Preservatives.
Apart from the four main ingredients of oil, water, emulsifier and preservative, lotions can also contain various other ingredients such to humectants to make them more moisturising, active ingredients to achieve a specific purpose or bring an 'X-factor', thickeners to manipulate the consistency, etc. You can make a lotion as simple or as fancy as you like!
As we have learnt, a lotion is an emulsion and contains four key ingredients: oil, water, emulsifier and preservative. When formulating, these ingredients are divided into three phases: a heated oil phase (oils and emulsifier), a heated water phase (the water), and a cool down phase (the preservative).
The oil phase is heated because the oils and emulsifier need to be melted together, and the water phase is heated because it needs to be in a similar temperature range to the oils for emulsification to occur. You can use the water cold but I find that emulsions turn out much better when the water is heated to match that of the oil temperature.
You will heat your oils and water phases in separate beakers in a water bath. A water bath is simply a pot of simmering water in which you can rest the beakers containing different phases. This way all the ingredients are heated gently and safely. You can use a microwave to heat the oil phase but you will need to be very careful and microwave for short bursts to prevent damaging the oils.
The heated oil and water phases are then combined, and you use a high shear blender such as a soup blend to mix them together. Use short bursts to blend, then let it cool for 5 minutes then another short burst of blending. Continue this blend-cool-blend cycle until the emulsion has cooled. Then blend in the cool down phase of the preservative. You can then decant your lotion into a pump bottle and use.
Now that we know what’s in a lotion and how it comes together, let's get into some recipes. You can use any carrier oil in your oil phase. I like a blend of almond and jojoba oil, but feel free to experiment with your favorite oils. You can also use whichever essential oils suit your needs and nose.
It is important to sterilise all utensils and equipment before making your lotions and it is best to use an immersion blender (stick blender) for all the mixing, as high shear is important for emulsification.
Healing Frankincense and Myrrh Lotion
15ml / 8% coconut oil
15ml / 8% emulsifying wax
125ml / 72% freshly boiled and slightly cooled distilled water
cool down phase
2ml / 1% Geogard 221
10 drops frankincense essential oil
10 drops myrrh essential oil
Option: leave out the frankincense and myrrh and use any other essential oil
As always, sterilise all utensils before you use them. Melt the emulsifying wax and the coconut oil gently but thoroughly in a water bath. Remove from the heat and stir in the almond or olive oil. Slowly blend in the water using the blend-cool-blend cycle. When the lotioin is made and cooled, blend in the essential oils and preservative. Pour into a pump bottle or jar and store in a cool place.
Want to make something a little more fancy? Try this vanilla body lotion:
Vanilla Body Lotion
35% heatedoil phase
10ml jojoba oil
10ml macadamia oil
5ml avocado oil
7ml Olive M1000
3ml cetyl alcohol
60% heatedaqueous phase
60ml distilled water
5% cool down phase
1ml preservative such as Geogard 221
2ml D-Panthenol (ProVitamin B5)
2ml vanilla oil
Sterilise all equipment. Heat the aqueous phase in a water bath (bowl over pan of simmering water) to around 70 degrees. At the same time, gently heat the oil phase in a separate water bath also to 70 degrees. When both phases have reached 70 degrees, remove from heat and slowly add the oil phase into the water phase, stirring continuously. As emulsification takes place, place the bowl in some cold water to cool, still stirring. When the mixture cools to 40 degrees, add the preservative, panthenol and vanilla. Keep stirring until room temperature, then pour into a glass jar and store in a cool place.
Hopefully this blog has made lotion making a bit easier to understand. It may be a bit of a learning curve when first working with emulsifiers but I hope this inspires you. Happy making!
Lotion Making Part 2 is out - read it here!
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