Picture of Bathtub Soap Crayons
These bath crayons are easy to make, and most importantly, kids love them!  I used a bar of almond soap that was given to me around Christmas, but you can use any white bar soap as long as your kids don't have a skin reaction to it.
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Step 1: Ingredients and Supplies

Picture of Ingredients and Supplies
To make these soaps, you need the following:

1 Cup of soap- any white bar you'd like

Food coloring

2 tablespoons warm water

Bowls- 1 for each color you want to make

Cheese grater

Molds- I used empty candy trays, but you could use ice cube trays, cookie cutters or even mold them with your hands if you'd like

Fork- for mashing it all together

Paper towels

Step 2: Grate the Soap

Picture of Grate the Soap
Grate your soap on the smaller side of your cheese grater. Since I was making a set each for my niece and nephew, I doubled the amount and grated 2 cups of soap, which was about half of a fairly large bar.

Step 3: Add Water and Mix/Mash

Picture of Add Water and Mix/Mash
Add 2 tablespoons warm water for each cup of grated soap you have. It won't look like enough at first, but after you begin mixing, you'll notice it start to stiffen up and become thick. I find it easiest to mash the whole thing together with a fork rather than stir. Keep mixing until you have a thick, even consistency throughout and no soap gratings left.

Step 4: Separate and Color

Picture of Separate and Color
Separate your soap evenly into as many bowls as you have colors to make. Use your food coloring to dye the soap. I started with 2 drops of coloring per bowl, then bumped it up to 4 each for brighter colors. If you're using the same fork to mix all of the colors, start with the lightest color first, wipe the fork off with a damp paper towel after that color is fully mixed, and move on to the next lightest color. This way, any residual coloring you have on the fork won't dirty your next color. Continue until all of your colors are mixed to your liking.
tqwerty4 years ago
just wondering.. does the food colouring make your kids sticky?
mksabrina (author)  tqwerty4 years ago
I've never heard of it making people sticky. It's possible different brands might react oddly, but I just use the generic grocery store brand and it works without issues. Hope this helps!

you can make your on NATURAL food dyes.

you could probaly look on this website for a key to the colors and recipes

also, does it stain?
mksabrina (author)  tqwerty4 years ago
I haven't had problems with these staining, either. Just be sure you don't use copious amounts of food dye, and you should be fine.

The colour didn't show up once in the tub.

scarah901 year ago

These are a great idea. Is it difficult to wash off of your tub?

happyjo4 years ago
Will the bath crayons melt when they are out of the freezer or are they good to go?
mksabrina (author)  happyjo4 years ago
They won't melt, freezing just speeds up the solidifying process.
evaramos894 years ago
im going to make a project with your idea
mksabrina (author)  evaramos894 years ago
Let me know how it turns out!
AZNdude4 years ago
Hey mine got made into a featured article, but it isn't showing up on the front page. Can you help me since I noticed yours is on the front page.
mksabrina (author)  AZNdude4 years ago
Hmmm... I'm still fairly new here and don't know a whole lot about the inner workings of Instructables. Maybe try asking in the forums? Someone there is bound to know. Hope you get it figured out!
I got it all figured now.
Thanks for your help!
Cloudlin4 years ago
Aww these are so cute!
AZNdude4 years ago
How do I vote for it in the contest?
mksabrina (author)  AZNdude4 years ago
You have to wait until the entry deadline passes (Jan. 2). Then you can go to the contest page and vote for as many as you'd like while voting is open. Thanks for your interest!
jjps4 years ago
I remember having these when I was younger. I loved them. This is a cool idea.