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      why? where? how? what?

      the science behind the magic of tubbubble
      tubbubble’s fun effects are the result of highly innovative German research & development and manufacturing processes. 
      With tubbubble the whole family can learn together how the science behind the magic works. 


      Our crackling crystals are a combination of a kind of sugar (sucrose) and carbon dioxide (CO2) - just like popping candy you know and love - but additionally covered with cocoa butter to make sure the skin is moisturized and smooth after soaking in tubbubble’s Crackling Bath Crystals.

      Now to the production of the crackling crystals: First, the sugar is heated and brought to boil at 300 degrees F (150 degrees C). Then, the sugar is mixed with carbon dioxide under a lot of pressure – 600 psi. Just to compare the normal atmospheric pressure is 14.7 psi, which means that a column of air one square inch in area rising from the Earth's atmosphere to space weighs 14.7 pounds. As the sugar cools down, the carbon dioxide is trapped within as tiny 600 psi bubbles.

      We take those sugar crystals in our production facility and cover them with cocoa butter to add skin care to our fun factor.

      Once the crystals are in the warm water, cocoa butter and sugar start to dissolve. The bubbles in the sugar pop with a loud crackle. What you are hearing is the 600 psi carbon dioxide being released from within.

      Side note: Crackling crystals can only be produced in a few facilities across the globe as the process involved high pressure and many security measures.

      Now your kids can experiment and try it themselves!

      Shop tubbubble Crackling Bath Crystals


      Bubble bath products can be liquid (as most are) or solid (like tubbubble’s) and all contain some kind of surfactant. Surfactants are foaming agents that create bubbles. Bubbles are air with a thin layer of water around it that is created by those surfactants. Bubbles are fun and the also clean the skin.

      Surfactants have a structure that includes an hydrophobic end that hates water and runs away from it, as well as an hydrophilic end, which loves water and wants to be in contact with it.

      tubbubble Surfactant Molecule

      When you add air to the mix of water with surfactants, you create a thin layer of water around this air. The hydrophilic ends of the surfactant gather in that water. The hydropobic ends to the inside and outside – the air side. They create and maintain a bubble.

      tubbubble surfactant molecules gathered on thin water layersingle bubble tubbubble the science behindtubbubble surfactant molecules as bubbles in the bath tub water

      Air can be added by moving the water with your fingers, by putting the bubble bath under running water or, in case of tubbubble, by squishing the pouch with your hands. The fleece pouch has tiny holes and the water with surfactant is pushed through them like thousand of mini bubble blowers, creating the bubbles.  

      The hydrophobic end is also lipophilic – loves oils and wants to embrace them… Do you understand where I am going? Bubbles tend to trap oil or dirt molecules inside of them, thus cleaning our skin.

      tubbubble bubble with dirt molecule inside - cleaning

      Now your kids can try to make bubbles with our tubbubble Bubble Bath Pouch in all 3 ways: squishing the pouch, putting it under the running water and swishing the water with their fingers. Enjoy!

      To learn more about the surfactants used in tubbubble, read THE SCIENCE BEHIND tubbubble’s Sodium Coco Sulfate.

      Shop tubbubble Bubble Bath Pouch


      The foaming agents in our pebbles are sodium bicarbonate (or baking soda) and organic tartaric acid. Most foaming products use citric acid. Not us. We use tartaric acid because it does not dry out the skin and does not burn in the eyes.

      Learn more about Tartaric Acid and Sodium Bicarbonate

      Coming back to our sodium bicarbonate and tartaric acid. Both substances are non-reactive when dry, but they react when in water. They try to neutralize each other (called neutralization reaction) because sodium bicarbonate is basic or alkaline and tartaric acid is, as the name says, acidic.

      Carbon dioxide is formed when these two substances hit the water. It escaped quickly as gas bubbles causing the foam.

      This foam shoots out of the tubbubble Foaming Bath Pebbles package taking with it our surfactant, Sodium Coco Sulfate, to create more bubbles and clean, all of the skin care elements in the product (oils, cocoa butter) and the gardenia extract that colors the water.

      Your kids can see this effect best, when you open the tubbubble Foaming Bath Pebbles package on the dotted line. But they can also experiment putting all pebbles in a cup to see how the foam rises before throwing them in the water to get clean and smooth.

      Shop tubbubble Foaming Bath Pebbles


      Most cosmetic products rely on food colors for their pigmentation. We decided to avoid both food colors and artificial dyes as we wanted to avoid allergenic potential of those ingredients (among other risks) and our goal was to create fully natural products.

      So we use gardenia for tubbubble’s water effects. There are different types of gardenia and the flower as well as the fruit are used. Gardenia is a flowering plants in the coffee family, from tropical and subtropical regions. The plant is evergreen and the flowers white with an amazing scent.

      Depending on the state of ripeness of the flower, different pigments can be extracted from it: red, yellow or blue. You need a lot more gardenia in a formula to have the effect you get in tubbubble as compared with color additives, but the advantage can be felt – the colors don’t stain your kids skin (they can play with the tubbubble products and their fingers won’t turn colors!), the bathtub and towels won’t get stains and the products are much more skin-friendly.

      Now, do you know why the colors in the dry product are much less vibrant than after being dissolved in the water? It is because the pigments are activated through water and achieve their active state of coloring.

      Try out all our tubbubble products and see for yourself!

      Shop our tubbubble Fun Pack


      White light is actually made of different wavelengths of light that have different colors. If you separate each wavelength, for example, with a prism, you will see each color separately that represents light in a specific wavelength.

      visible light being separated in 8 colored wavelengths by a prism

      visible light wavelengths

      The color we see is a reflection of that light on the surface of an object coming back to our eyes. If an object is blue, it will absorb all the wavelengths of other colors and will reflect blue – so we see it as a blue object. If the object is green, it absorbs all other colored wavelengths and reflects the green ones – so we see green. And so on.

      visible light being reflected by green surface

      The same counts for our tubbubble products. For example, the pigments in the tubbubble Foaming Bath Pebbles activated by water, turn the water purple because they dissolve in it, absorb all other colors but reflect purple.

      Side note: A rainbow, as another example, is nothing else but the daylight being reflected by millions of water particles in the air showing the different colored wavelengths.

      As we explained in THE SCIENCE BEHIND Natural, dye-free water effects, Gardenia gives us blue, yellow or red pigments. When we mix these colors, we get other ones:
      red + yellow = orange 
      red and yellow equals orange
      blue + red = purple (like in the tubbubble Foaming Bath Pebbles)
      blue and red equals purple

      Depending on the quantity of one or the other pigment, you can shift the color:
      a lot of blue + a little of yellow = teal (like in the tubbubble Crackling Bath Crystals)

      You can see how the water turns colors with tubbubble! You can also experiment creating new colors using watercolors. Enjoy!

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