The Best Recipe To Make Rock Hard Bath Bombs!

Today I'm showing you how to make rock hard bath bombs. Seriously, the thumbnail is not just for show. This is currently my master bath bomb recipe.

RECIPE: 1 cup baking soda, 1/2 cup citric acid, 1/4 cup corn starch, 1/2 teaspoon sodium lauryl sulfoacetate (SLSa), 8 milliliters fragrance, 6 milliliters polysorbate 80, 5 milliliters water. Baking soda & citric acid create fizzy reactions. Corn starch is a filler & may be substituted for another starch or flour. The slsa is going to slow reactions in the water so the bomb doesn’t dissolve so quick. You may use an alternate "bubble bath maker" (linked below). Substitute fragrance with carrier oil OR 1/2 essential oil & 1/2 carrier oil. Polysorbate 80 may be substituted with polysorbate 20 (but the resulting wet liquid will be thinner, which means it has a greater chance of causing reactions within the mix). The water is what makes the bath bombs rock hard (this should not be replaced).

DIRECTIONS: Add wet & dry ingredients to separate containers & mix thoroughly. Add mica to wet to reduce airborne particles. Add wet ingredients slowly to dry while whisking. Now thoroughly mix & knead the batch with your hands. I used a 2.5" mold (linked below, go to "molds"). Fill the mold. Lightly pack it. & Sprinkle loose mix on top. Smoosh the 2 sides together tightly & tap both sides to release the bomb.

QUICK TIP: If your bomb releases without the aid of tapping, it's almost certainly not packed with enough mix.
***Why do the wet ingredients gel up & become one big blob? I don't know the science of why this happens, but it's normal & polysorbate 80 is the culprit. Some ingredients don't activate it & others do. This will not affect your recipe. Simply place the blob in the dry ingredients & mix as you normally would.***

EXPERIMENT SHEETS:
EXPERIMENT SHEETS EXAMPLES:

VIDEO LINKS:
Bath bomb-making 101 playlist:

The link below contains affiliated links. As an Amazon Associate, I earn a very small percentage from qualifying purchases. Your support allows me to keep making free tutorials at no extra cost to you (prices are same as website)!

RECOMMENDED ITEMS:

*MICAS* Shop on Marblers website for discount!
15% off orders over $50 PROMO code: bathlab10 * 5% off below $50 PROMO code: bathlab05

ECO GLITTER: bad girls & cotton candy:
Fizz Fairy: Use promo code: bathlab10 (on orders $50.00+)

Magnolia Blush fragrance oil

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CHAPTERS:
0:00 - Introduction
1:27 - Recipe
3:32 - Molding
5:10 - Pro Tip
5:57 - Results

[SargentBubblescom]

Hey mama - You won't believe this! Ok, so I witnessed it and I still can't believe it!! This recipe actually WORKED!! Can you believe that?? I just made 3 gorgeous bombs - and they all stuck together and look beautiful! (Light pink with some Cotton Candy glitter - thanks Fizz Fairy!) I am so proud of myself - and have you to thank for my success. THANK YOU!! ❤❤ These are for a customer and I'm stoked I didn't spend all day trying to make bombs only to have issues with them. No issues with these - this recipe must be in the Bath Bomb Hall of Fame or Ripley's Believe It or Not. No lie. This recipe is da bomb!! I'm so glad I tried it - and am beyond grateful that you posted such an easy formulation that actually works!! Yahoo! I just had to let you know. And the ones I made were CBD bombs - and they came out beautifully! Thank you, thank you, thank you!! I no longer dread or fear making bombs, thanks to Dora the Diva. You're the best, lady!!, ❤❤❤

[makeit]

Dora, your recipe is fantastic - these were rock hard right out of the molds! The tester had nice spinning and foaming action, too. Using your exact recipe, I did convert everything to grams since that's my preference for measuring; I also quadrupled it, which made exactly 10 bbs in my #3 sphere mold. Here it is in case anyone else wants to measure by weight:
890g bicarb
432g citric acid
124g cornstarch
20g SLSa
32ml FO
24ml PS80
20ml water
1 T mica

This has renewed my enthusiasm for making these after having a lot of other failed batches. Thank you 💝

[Jane-West]

Another home run Dora! I am always amazed when someone spends so much of their time, energy and resources and then just freely and happily shares it with others... what a beautiful, kind and generous thing! I hope you know how much we all appreciate you and I really can't thank you for all the help and inspiration you've given me! Can't wait to try these bath bombs and can't wait for the highly scented recipe!

[sorayashahi]

You’re seriously my favorite YouTuber. Thank you so much for sharing all your knowledge.

[Jr-ndkd]

Ur a genius and an oracle with your bath bomb blob. I tried it and it worked like a breeze. No pre activation like my prior attempts. Thank you ..u

[SheasBathLab]

I just have to say Thank you! Thank you for all you do! You have saved many people so much time.

[thebathtime]

I can 't wait to try out this recipe! Your tips for making this is really amazing. Thanks a bunch!

[debbiewhitman]

I am so thankful for you and your experimentation. I appreciate everything you share with us! Have a great day!

[amberlyles]

❤❤❤I mean this is amazing! You have single-handedly convinced me I can do this. Following this recipe I’ve made about 20 batches and haven’t had a single failure because your instruction is so amazing! Thank you!

[lizbrown]

THIS TEACHING IS ASTONISHING...YOU DID SO MUCH RESEARCH ❤❤❤

[justme]

Hi Dora! I still think you should write a book with all your knowledge. I would be the first one to buy it! Your videos are amazing 👏 😍

[hm-crlt]

I'm not gonna lie, I was a little skeptical about the hardness of the bathbombs since I've literally purchased recipes that failed. You're definitely my hero!!!!❤ Thank you so so much for sharing this! The bathbombs I made with your recipe SOLID!

[xFlossy]

Thank you so much, my boys love bath bombs but I can't afford to keep buying them... Shrinkflation and all so this is saving me a tonne of money as well as getting them involved in some good clean fun.

[sharondobin]

Thank you so much for your generosity in sharing the results of your hard work!!!!

[kelleykraftsitall]

Thank you so much for this Dora! I live in Arkansas and in the summertime making bath bombs can be brutal. I love that these are rock hard and no cream of tartar. It is so expensive right now. What a game changer and I can't wait to try these, Mine will come out rock hard but, sometimes the middles will still be soft, but I used isopropyl alcohol and I think that may be why my bombs sometimes say a bit softer in the middle. Not sure just a hunch. Thanks sweetie, You are the best on the net when it comes to bath products. I enjoy your videos so much. Thank you for all that you do. Hugs sweet friend.

[maryroseshearer]

Thanks Dora! Great video set with sooo much helpful information! Don’t you ever stop?! Or sleep?! We love your wonderful ideas and glitter everywhere. Don’t stop being obsessed with bath bombs or a colorful imagination. -Momo

[katiedionne]

I love your videos!!! I used a liquid dye in the polysorbate 80, and when I add the water it immediately turns into a gel—what is this magic?

[Soylarimar]

Your color powder upgrade game is so on point now paired w rock hard and pretty bombs I can’t wait to try!

[hollythomas]

Dora, you go girl!!! I love seeing your videos that you share and I thank you greatly for doing so! I haven't made bath bombs in almost 2 years but I would love to try this one! Thank you for sharing after ALL of the hard work you've put into this! You're so awesome!

[TSweet-pqdx]

You’re very inspirational Dora! This has been a game changer! The blob from your other video has been as well, Thanks! ❤