Stearic acid is a saturated long chain fatty acid with an 18-carbon chain that's used in different products as a hardener or thickener. You can use stearic acid to harden wax, creating an opaque appearance for your wax creations. And you can use it with pillar or votive wax to make gel wax embeds. In soap making, stearic acid is used to make the soap harder and allow it to last longer.
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