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2 hours
About 8-10 bars

Rainbow Bubbling Bath Truffles Project

This project isn't quite a bath bomb, bath melt, or bubble bar – it's a little bit of everything!
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  • Supplies
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In this recipe, the combination of baking soda and citric acid creates a mild fizzing reaction. The addition of SLSA creates bubbles, while cocoa butter and shea butter add moisture to the tub. Fruity Fusion Fragrance Oil gives the bath truffles a fruity scent. Because of the cocoa butter, the bars smell a lot like chocolate-covered gummies – yum!

When added to the tub, the bath truffles fall to the bottom because the butters make them quite heavy. Slowly, they start to fizz and disperse the skin-loving ingredients. If you want to activate the bubbles, hold the bar directly under the faucet once the tub is almost full. Break up small pieces of the bar in the running water. You can also place the bar into a fine mesh strainer and hold the strainer under the faucet to help activate the bubbles as well. The bubbles are modest because of the butter, but still cover the surface of the tub. 

Typical solid bubble bath recipes can take a week or more to become firm. That’s because most of the moisture in solid bubble bath recipes comes from glycerin. One of the great things about this recipe is the bars harden within a few hours because they're made with more butter. 

While these bars are extremely vibrant thanks to micas, we found the colors don’t transfer on the tub. Polysorbate 80 prevents the colors from clumping up in the bath water. All the colors in this project can be found in the Rainbow Mica Sampler Pack. You can also use La Bomb Colorants. Oxides and pigments are not recommended. They are larger than micas, which make them harder to mix in and could transfer color to the tub or your skin.

  • Skill Level: Advanced

  • Time to Complete: 2 hours

  • Kit Yields: About 8-10 bars


11 Ingredients
11 Ingredients
11 Items
We do our best to include just what you need to make your project, however due to available product sizes, you may have left overs.
Sodium Bicarbonate - 1 lb
Sodium Bicarbonate - 1 lb Item#:IB002935
Varient/Quantity/Set: 0
size: 1 lb
Price: $2.00

Citric Acid - 1 lb
Citric Acid - 1 lb Item#:IB000052
Varient/Quantity/Set: 0
size: 1 lb
Price: $3.25

Sodium Lauryl Sulfoacetate - SLSA - 1 Jar
Sodium Lauryl Sulfoacetate - SLSA - 1 Jar Item#:IB002874
Varient/Quantity/Set: 0
size: 1-28 oz jar
Price: $25.85

Cream of Tartar - 2 oz
Cream of Tartar - 2 oz Item#:IB002994
Varient/Quantity/Set: 0
size: 2 oz
Price: $2.00

Shea Butter - 1 lb
Shea Butter - 1 lb Item#:IB002473
Varient/Quantity/Set: 0
size: 1 lb
Price Each: $7.99 Now: $7.19

Organic Cocoa Butter Wafers - 1 lb
Organic Cocoa Butter Wafers - 1 lb Item#:IB002499
Varient/Quantity/Set: 0
size: 1 lb
Price Each: $12.99 Now: $11.69

Glycerin - Liquid - 1 lb
Glycerin - Liquid - 1 lb Item#:IB002000
Varient/Quantity/Set: 0
size: 1 lb
Price: $3.20

Polysorbate 80 - 1 oz
Polysorbate 80 - 1 oz Item#:IB002429
Varient/Quantity/Set: 0
size: 1 oz
Price: $2.99

Fruity Fusion Fragrance Oil - 2 oz
Fruity Fusion Fragrance Oil - 2 oz Item#:IB001676
Varient/Quantity/Set: 0
size: 2 oz
Price: $5.80

Rainbow Mica Sampler Pack
Rainbow Mica Sampler Pack Item#:CB603152
Varient/Quantity/Set: 0
Price: $9.99

Fine Silver Rainbow EcoGlitter - 1 oz
Fine Silver Rainbow EcoGlitter - 1 oz Item#:IB001992
Varient/Quantity/Set: 0
size: 1 oz
Price: $7.99




Rainbow Bubbling Bath Truffles Project
This project isn't quite a bath bomb, bath melt, or bubble bar – it's a little bit of everything!


25 oz. Sodium Bicarbonate (Baking Soda) (41%)
7 oz. Citric Acid (12%)
13 oz. SLSA (21%)
2.5 oz. Cream of Tartar (4%)
1 tsp. Fine Silver Rainbow EcoGlitter
6 oz. Shea Butter (10%)
4.5 oz. Cocoa Butter (7%)
1.5 oz. Liquid Glycerin (3%)
0.5 oz. Polysorbate 80 (1%)
0.6 oz. Fruity Fusion Fragrance Oil (1%)
Rainbow Mica Sampler Pack



In a small heat-safe container, add 6 ounces of shea butter and 4.5 ounces of cocoa butter. Place the container in the microwave and melt the butters using 30-60 bursts. Be careful when removing it from the microwave, as it may be very hot.


Add 0.6 ounces of Fruity Fusion Fragrance Oil, 0.5 ounces of polysorbate 80, and 1.5 ounces of glycerin. Use a spoon to thoroughly incorporate. Set aside.

add fragrance to oil



Place a fine mesh sifter over a large container. Push 25 ounces of baking soda, 7 ounces of citric acid, 2.5 ounces of cream of tartar, and 1 teaspoon of Fine Silver Rainbow EcoGlitter through the sifter into the container. Mix with a whisk. Very carefully, add 13 ounces of SLSA to the large container (do not put it through the sifter). Add it last, because SLSA goes airborne easily and can be irritating. You can use a mask if you like. Slowly mix together the dry ingredients using a whisk.

mix dry ingredients



When the liquid ingredients are about 180° F, add about 1/3 to the melted butter mixture. Because the liquid is hot, use gloved hands to mix.

add wet ingredients



Continue adding the liquid ingredients to the dry and mix together until fully incorporated. The warmer the dough, the softer it will be. We found a dough temperature of about 85-100° F is a great moldable texture. If it's cooler, place the entire mixture into the microwave for 10-20 seconds to warm it.

hand mix



You will have about 60 ounces. Split the batch into 7 equal containers - each one should have about 8.5 ounces. We recommend weighing all the containers to make sure you have an equal amount.


To each container, add the following amounts of mica. Use your hands to mix in the mica thoroughly until there are no streaks of color. You may want to change gloves when moving from warm to cool colors.

  • Red/Pink: 1/8 tsp. Raspberry Mica
  • Orange: 1/4 tsp. Racing Stripe Orange Mica
  • Yellow: 1/4 tsp. Buttercup Mica
  • Green: 1/8 tsp. Kelly Green Mica
  • Blue: 1/8 tsp. Caribbean Blue Mica
  • Purple: 1/4 tsp. Queen’s Purple Mica
  • White: No colorant

colored dough



Clean off your counter. Place a sheet of parchment or wax paper down and sprinkle on a light layer of baking soda to prevent sticking. Working with the red/pink dough first, begin to form a long, flat dough shape. Place it on your work surface.


Continue making long, flat log shapes with the orange, yellow, green, blue, and purple colors. Place each color on top of the last, and use your hands to gently press the colors together and form an even shape. Finally, place the uncolored portion on top of the purple.

layered dough



Use your hands to press the colors together into one log. It should be about 12″. 

log of dough



If you’d like the colors to have a little more movement, very carefully twist the log. While twisting, be sure to press the log together to avoid large cracks or tears.


Carefully remove the log from the liner and use a sharp knife to cut it into bars. Do so very gently, as the bottom can crumble. If this happens, use your hands to reshape the bars. Rolling the log after each cut helps maintain a more even circular shape.

slice dough into pieces



Very carefully place each bar face down on the parchment or freezer paper. Use your hands to reform any bars if needed. It takes about 3-4 hours for the bars to harden, depending on your room temperature. It can be hard to wait, but be patient!


Once you’re ready to use the bath truffles, place them in the tub for a slow fizzing reaction with a small amount of foamy bubbles. If you want to activate more bubbles, hold the bar directly under the running bath faucet while breaking off small amounts of the bar.

Tutorial credits

Photographer: Amanda Kerzman




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