Upcycling - How to make Crystal Brush Soaps

Modern waste minimization protects our environment and has positive economic benefits. The concept is built on a waste hierarchy of Reduce, Reuse, Recycle and Recovery (the 4 R’s). In an effort to make a more sustainable world and encourage artistic work, Rock & Herb Upcycling Series explores the creative Reuse of unwanted products into higher value products. Enjoy watching our Upcycling videos and have fun upcycling!

How to Make Crystal Brush Soaps


Items to be reused
    •    Gold cap from Rock & Herb cream jar (or any shallow container)
    •    Milk carton (1 per crystal color)
    •    Old soaps if not using new soap

    •    Empty milk/juice carton per crystal color
    •    Oil soluble soap dye or lip dyes
    •    White opaque glycerin soap
    •    Transparent glycerin soap
    •    Heater
    •    Pot
    •    Stirrer
    •    Spoon
    •    Soap knife
    •    Cutting board
    •    Cap/container to upcycle and hold crystal brush soap
    •    Water (optional)
    •    Fragrance (optional)


Day 1
    •    Cut transparent glycerin soap into small pieces and melt transparent glycerin soap over a heater
    •    Add oil soluble soap or lip dyes and stir until color is even
    •    Cut empty milk/juice carton at the top
    •    Pour melted colored soap into empty milk/juice carton
    •    Leave overnight to cool and harden

Day 2
    •    Release overnight cooled colored soap from milk/juice carton.
    •    Cut colored soap into strips and at slanted angles to make the crystals. Make one group shorter than the other.
    •    Cut white glycerin soap into small pieces and melt white glycerin soap over a heater
    •    Scoop melted white glycerin soap into cap/container to upcycle. Fill up to halfway height of the cap/container.
    •    Assemble the soap crystals, with taller crystals at the center and shorter at the outer circumference, into the melted white soap base before it hardens
    •    Allow to cool. Your crystal soap brush is now ready for use!

 Notes and Tips
    •    If the soap melt is very thick and sticky, this means you need to add some water. A usual amount is 10% (e.g. 10 mL water to 100mL soap). Adding water will also make the final soap softer and give you bigger bang for your buck.
    •    Cover the pot during the soap melting to reduce soap skins forming at surface
    •    The white soap base alone in the cap without crystals work just as well as brush soaps and takes less time.