Introduction: How To: Make Bath Bombs

Picture of How To: Make Bath Bombs
Everybody loves bath bombs. It is like taking a bath in champagne, only without the show tunes and chorus boys. They are fairly simple to make, keeping in mind that the strangest things can make a batch go weird; humidity, room temperature, oil viscosity, the moon rising in the seventh house of Aquarius . . . they are a mysterious wonder.
For this recipe, I am using ingredients that are pretty common, or easy to find in most areas. Essential oils can be found in small amounts at places like health food stores and craft stores often carry essentials and fragrances. Just make sure, if you buy fragrance oil, that you are buying "body safe" oils and not stuff for candles or oil warmers.
So, let's start with a basic recipe in two parts.
Dry ingredients: (By Weight, as measured on a scale.)
  • Baking Soda - 8 ounces
  • Citric Acid - 4 ounces
  • Corn Starch - 4 ounces
  • Salts - 4 ounces ( in these pictures, I used Dead Sea Salts, but mineral salts work too, and are easier to find and significantly less expensive.)
Wet Ingredients:
  • Water - .75 tbsp
  • Essential or Fragrance Oil - 2 tsp (for these I used a Ginger Peach.)
  • Oil - 2.5 tbsp (I used cherry kernel, but any light vegetable oil will work.)
  • Food coloring - 1 or 2 drops. (Your color will look very dark in the emulsion, but will be light in the fizzies, so as to not leave rings around the tub. For this batch I used one drop red and two drops yellow. The final result will be very light peach.)

Step 1: Blend the Dry Ingredients

Picture of Blend the Dry Ingredients

Begin by putting all of your dry ingredients into a big bowl. Glass is best because it is non-reactive. Whisk or pestle those pesky clumps out. You want a fairly smooth consistency throughout the entire mix.

Step 2: Mix Liquid and Blend Dry and Liquids Together

Picture of Mix Liquid and Blend Dry and Liquids Together

Blend your wet ingredients together. I usually use a small jar and shake it up. Don't worry about separation too much, you are not going to get a full emulsion. Then, while whisking, slowly add small amounts of the liquid to your dry ingredients. Here we see my faithful Igor prepare to pour.

Step 3: Try to Avoid Creating Volcanoes

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If the mixture starts to foam, you are adding the liquid too fast. Quickly whisk the reacting ingredients into the nonreactive part and you should be able to stop the reaction. I add about a teaspoon at a time. When all of the wet ingredients have been added, you should have a mixture with the consistency of slightly damp sand. It should clump together when you squish it.

Step 4: Mold Quickly

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Once your mixture is together, you have a pretty limited amount of time in which to get it into molds. To create the giant Soapy Hollow ball of bath doom, I use round christmas tree ornaments that were designed to be filled with goodies. To do a three-dimensional bomb like these, you pack each side, then overfill a tad at the center and press the two sides together.
It takes a little practice to get a feel for how much filling you need, so don't get discouraged if your first couple fall apart. Here we see Igor holding a filled ball and wondering about child labor laws.

Step 5: Unmold and Let Dry

Picture of Unmold and Let Dry

You don't need to leave them in the mold for very long, and in fact can tap them out as soon as you fill them. These are four bombs we made with this batch.
You can use all sorts of things to make your bombs; muffin tins, ice cube trays, candy molds, Aunt Magnolia's denture case . . . whatever makes you happy.
This batch didn't make quite enough for five bombs, and the humidity levels made the batch start to puff up, so I quickly stuffed what was left of the batch into my "bath cookies" mold. Note: When using things like silicon trays that surround the seltzer mix, or any mold with a lot of details, the mix must stay in the mold until dry, or it will crumble when you try to take it out.
Once they are completely dry, store bath bombs in an airtight container or bag. High humidity will make them activate. Because we used oil and water and no preservatives, you want to use them within about 6 months. Assuming you can keep them for that long. Igor demands payment in immediate fizzy baths, but you may have better luck actually getting to *use* yours.
When you're ready to use one, just drop it into a warm bath, and relax.


backcountry (author)2009-01-20

OK, here they are! I bought 4 of these molds and one batch filled them with a little to spare. I started early for Valentine's Day so I had time to screw up a couple of batches, but I think these are going to be fine as. Peppermint. Maybe I'll make one more different batch. What about glycerin instead of oil, would that work? I used almond oil, but I wasn't really happy with it.

susie-q (author)backcountry2009-02-05

where did you get theose heart molds? They are cute!!

WilkinsonM (author)susie-q2018-01-14

u can buy the heart shape moulds on ebay but basically u need a heart shape clear plastic bauble mould u can also get the star shape moulds too

backcountry (author)susie-q2009-02-06 I just googled 'fillable plastic hearts' and started clicking. The ones I got are 80 mm (the medium size). In retrospect, they're pretty big, I'd recommend going with the small ones.

SoapyHollow (author)backcountry2009-01-22

Those are gorgeous! Word of caution: eucalyptus, peppermint/spearmint/wintergreen type oils in a bath product may give you the ability to levitate and walk on water. (Don't ask how I know...well, you could's a pretty funny story.) Suffice it to say that girly bits and tingly can be a bit, erm...intense. ;) Also, I don't know if you have an Ikea near you, but they make the grooviest silicon icecube trays in various shapes; one of which is hearts. I've used their trays over and over for bombs, traditional soap and glycerin soap and they just last and last. They're cheap and durable. Yay!

carminedacat (author)SoapyHollow2009-07-02

i planned on making these for my sister as a birthday present and was hoping to make them peppermint b/c that's her fave smell... what exactly does the "levitation" thing mean...? sorry if i'm just not getting it... :-/

SharonM205 (author)carminedacat2017-09-23

Peppermint is a mint oil that causes a tingle, when too much is used the tingle is a burning sensation. If I use it I only use a tiny bit for fragrance. Some people are VERY sensitive to peppermint. It can also cause a break out of itchy spots.

NicoleH111 (author)carminedacat2016-09-20

Pepper mint will burn tender parts like the va_ja-ja its minthy vapour is a no no there , just like you will not use near eyes .

afridave (author)NicoleH1112017-02-01

just do not try using chillies...

afridave (author)NicoleH1112017-02-01

works on the little boys dangly bits too....


DariusA1 (author)patsy.bussey2015-01-08

Why would you respond to a 5 year old comment with 'seriously' instead of the answer?

sadie blue (author)SoapyHollow2015-01-07

well SoapyHollow the girly bits and tingly oils are good because you can feel like you are having sex in the bath. and thanx for the idea, its sex time!

susie-q (author)SoapyHollow2009-02-05

Here's one for you, I made bath salts and you add epsimons salt, could I put that in the bath bomb mix? Or will I blow up ha ha ! Not sure how to spell that salts hope you can read it

SoapyHollow (author)susie-q2009-02-05

Probably. :) Epsom salts are mineral salts. I'm not sure what else you put in the bath salt mix, but it should probably work.

backcountry (author)SoapyHollow2009-01-23

Oh my, I am so glad you mentioned that about peppermint! I've been "stung" by Dr. Brommers before, I should have known better. Now I know I have to make another batch with a different oil. One thing I like about these molds is that ice cube trays would make half hearts (they're flat on one side). These are snap-together, two piece molds. They make full 3d hearts, which I think is cool. I thought they might break apart unsnapping or trying to pry them out of these molds. But no problem, they plopped right out.

SoapyHollow (author)backcountry2009-01-23

Oh cool!

MercuryM (author)backcountry2014-12-21

Why didn't you like the almond oil? I am very curious to know as this is a gift and I am not sure what the benefits are to the different oils in bath bombs as far as skin benefits not just cool looks, smells and fizzies!

himynameisandy (author)2010-03-13

Hey guys, these are great! I made them yesterday and have packaged them up for my girlfriend this morning! Isn't she lucky it was raining yesterday and I couldn't work :P
I used 2 pairs of measuring spoons to form the molds, they worked well once I had the right consistency. I just forced them together to form a sphere. A 1 Tbsp one for the big ones, 1.5tsp for the medium, and 1/4tsp for the tiny ones.
Over here in a country town in New Zealand, its hard to find the right fragrance oils that are safe for skin. I know I could of ordered online, but it was a matter of now or never,  So while wondering what I could use to add some scent, I remembered how much my gf liked my CK cologne, so just cracked open my bottle of that, and poured about 2tsp of the stuff in. Didn't like being with the water much, but guess it was similar to oil.
Here's a couple of pics, Hope you like them.

You put perfume in your bathbomb and it actually smelled like it? Or is it better to use a scented oil type of thing?

SharonM205 (author)divine_lucy2017-09-23

Essential Oils are always best as they are (or should be) skin safe.

WhitneyJ (author)himynameisandy2015-11-24

Uh where do I find a guy to make me bath bombs :P

That is super sweet. Nicely done

Colorfulmama (author)WhitneyJ2016-08-31

you evidently teach them, like little ignore here ✌️?

Did it still end up fizzing well

Hi, i live in nz too and just writing my list of what to buy for my first batch of bath bombs and i really admire what you did. Would you mind sharing your recipe. Pm me on fb might be better,then i will definetly receive it. Looking forward to your reply. Thanks

Aislinn (author)himynameisandy2010-08-18

they look really cool my mum ordered molds online ages ago and we're making the stuff today

SoapyHollow (author)Aislinn2010-08-18

Sweet! I'd love to see pics when you're done! :)

WOW...that is too cute!!! she"s lucky :)

Gorgeous! Go you!

the Secrets of eden ( sells essential oils internationally!

Pinky212 (author)himynameisandy2010-05-02

Very pretty and nice job.  thank you for sharing that you used cologne.  I've wondered if it could be used but haven't done a project yet that would let me find out.  You have inspired me!

christine.takahashi.9 (author)2014-12-02

I just made these, they are so easy and brilliant. I used coconut oil and musk oil. They look and smell really good. I used a Christmas ice cube tray and it took me two trays to get all the moulds neat, but I got 54 giftable mini fizzies and some, well will just have to use myself, oh dear!

Pikacindy made it! (author)2014-08-31

This is my first time making bath bomb and although I made a huge mess in the kitchen, seeing the result really is worth it, thank you for sharing the recipe!!!! :)

SoapyHollow (author)Pikacindy2014-11-06

These are awesome! Go you!

soonersseth (author)2008-09-15

Great Instructable my mom liked her birthday present

codongolev (author)soonersseth2008-09-15

great birthday present idea.... I'd do it too if I could drive to a store to get all the oils and such. "hey mom, can you drive me to the store?" "why?" "to get essential oils." "....why?" ".......because they're essential."

SoapyHollow (author)codongolev2008-09-15

Hee! :)

SoapyHollow (author)soonersseth2008-09-15

Those are so fabulous! Go you!

suerose77 (author)2018-01-01

mine are crumbily when i take them out of the mold what am i doing wrong??

JuliaH18 (author)2016-01-22

Hey guys!! Ive used this recipe for months to make bath bombs. And all the batches that ive made have came out amazing. I have a question though; What are some good online fragrance oils vendors? Preferably cheap and a extensive collection.

I've been going to CandleScience for their fragrance oils. Theyre great and I trust the oils completely but their collection is limited when its come to body and bath safe fragrance oils.

If anyeone could, please hit me up with vendors/stores or so have you. Thanks :)

RobinO27 (author)JuliaH182017-12-11

Puritan’s pride online.

Tbone652 (author)JuliaH182017-03-24

Amazon....theraputic grade

KarinH17 (author)JuliaH182016-12-07 is a great inexpensive place to get essential oils therapeutic pure grade oils. I've been buying my oils there for a while and love them. Best prices online.

EmmaW79 (author)JuliaH182016-11-04 - they are the largest Essential oil provider in the world. 100% pure oils. They can be kind of spendy depending on the oil you want but they are so worth the cost. You have to use much smaller quantities of the EO than you would with others (drops compared to tsps.!)

CoriJ (author)JuliaH182016-03-28

Hi there, I just saw this post! I am a wellness advocate for doTERRA essential oils! They are simply amazing. When you choose doTERRA, you are choosing essential oils carefully distilled from plants that have been harvested at the perfect moment by experienced growers from around the world! Each bottle of essential oils has an ideal extract composition and efficacy. All doTERRA products are thoroughly tested using the strict CPTG certified pure therapeutic grade quality protocol to ensure purity. If you are interested in learning more about the beauty of Essential Oils please visit my site at or email me at I have made tons of Bath Bombs for friends bridal showers as guest favors, birthday gifts, etc and have used doTERRA essential oils. The feedback is amazing and everyone simply loves them with the EO. :)

DebbieR118 (author)2017-11-20

is Epsom salt ok to use for the salts

AmandaG195 (author)2017-06-14

you have probably already been asked, but...what about things like oatmeal powder?

Tbone652 made it! (author)2017-03-24

I made them for my wife as a surprise and she loved them!

My modifications:
- full tablespoon of water
- total of 5 drops of food coloring (I made a purple color for the lavender, and just yellow for the lemon grass)
- avocado oil

Turned out great, Thanks!

steriotypicalOutlaw (author)2017-03-04

Hello, would you happen to know how to color these? I know you can buy them in multiple colors, but is it possible to color them when making them yourself?

LisaB385 (author)2016-12-31

I just finished Its awesome I drug my husband into the kitchen to show him

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