Adding an emulsifier allows incompatible ingredients, such as oil and glycerin, to mix together smoothly and create a product that is less greasy.
It is recommended to use distilled or purified water instead of tap water to make lotion. This is because tap water often contains chemicals that shorten the shelf life of the product.
Water-based lotions have a much shorter shelf-life than oil-based lotions. Some tips to make lotions store for longer periods include storing in dark-colored glass bottle and adding pure alcohol or antioxidants.
Typically, making lotion involves variations of the following steps: creating a water bath with the bottom half of a double boiler, melting oil and wax together in the top half of a double boiler, pour boiling water into the melted wax mixture, and let cool before packaging the lotion.
Making Skincare has a great, detailed chart that includes the steps to making lotion, including different percentages of ingredients that should be used for different types of lotion.
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