Making crystal snowflakes seems to be the ‘classic’ Borax crystal science project. I’ve seen it in a bunch of places (like here, here, here, and here), but everyone seems to do it slightly differently. Some leave their snowflakes white. Some use coloured pipe cleaners. Some add food colouring to the solution. (And I’d heard of a fourth technique used to make crystal rocks, which I was super keen to try out with snowflakes to see if it worked!)
So, being science girls, we decided to do a little comparison experiment at home, to see which technique yielded the best looking crystal snowflakes.
Four ways to make crystal snowflakesWe used:
- 6mm furry pipe cleaners in white and navy blue
- invisible nylon thread and scissors
- Borax powder
- 4 wide mouth jars (or, more accurately, we used 3 jars and 1 tumbler – as I didn’t have a 4th matching jar…)
- boiling water
- spoons for stirring
- pencils or chopsticks for balancing on top
- paper (optional)
- safety glasses (optional, but recommended. We have these ones.)
- Pipecleaner snowflakes
1. Create pipe cleaner snowflakes by cutting and twisting the pipe cleaners. We used about 1.5 pipe cleaners per snowflake. Please bear in mind that snowflakes are always six-sided. Your snowflakes also need to be small and narrow enough to be able to easy dangle inside your containers, without touching the sides or bottom. We made 3 x white and 1 x blue snowflake.
2. Tie on a loop of nylon thread to one of the snowflake arms of each snowflake. This will be used to dangle the snowflake inside the jar (and also doubles as a handy ornament hanger later on).
3. (Please see safety notes at the bottom of the post before starting this step.) Fill your jars with boiling water. Add Borax powder and stir. Keep adding Borax until the solution becomes super saturated and you can’t add any more without Borax powder settling on the bottom of the jar. We used about four tablespoons of Borax powder per jar.
4. Add blue food colouring to just one the jars.
5. Loop your snowflakes over pencils (or chopsticks), to balance on top of the jars. Add a white snowflake to the jar with the blue food colouring, and the other snowflakes to the remaining jars. You can also add paper covers if you wish, by cutting out a circle slightly larger than the jar diameter, and cutting a radial line for the thread to pass through.
6. Leave for 24 hours (or longer). The solution will be cloudy at first, but will start to clear after about an hour. You can start to see small crystals forming, and they’ll continue to grow for the next couple of days.
7. Remove the snowflakes from the solutions. You should now have a blue crystal snowflake (the food colouring one), a second blue crystal snowflake (the blue pipe cleaner one), and two white snowflakes.
8. Here’s where we tried out the special new technique! Use watercolour paints to paint one of the white crystal snowflakes blue, and watch how the crystals absorb the colour towards the centre of the structure – it’s fascinating! (Thanks Happy Hooligans for the inspiration!)
Below is a pic of the watercolour painted crystal after it’s had a chance to dry. Can you see how the large outer crystals have remained largely transparent, and that the blue colour has snuck in through the little crevasses, in towards the pipecleaner at the centre of the crystal structure? This is a great way to demonstrate how moisture can seep though rocks. SO AWESOME!
I’m so excited about this new technique – we’re definitely going to try this again!
But, ahem, getting back to our original question – what’s the best way to make crystal snowflakes?
Below is how they all look being held up to the window. (Top left = watercolour, top right = food colouring, bottom left = blue pipe cleaner, and bottom right = control / plain white.
And here’s how they look outside in the sun. (The water colour one is the bottom right, and the food colouring one is bottom left.) I love how they all sparkle in the light!
And here’s how they look on the coffee table inside. (You can tell the watercolour one by now right? It is at the top.)
For me, the watercolour snowflake wins, hands down. Not only are you able to choose the colour that you want more easily (as you can choose from the whole watercolour pallet), but the way the paint is absorbed through the crystal structure is both fascinating AND beautiful!
Making crystal snowflakes would be a great winter science project, but as it happens, we made ours just before Christmas, and Christmas falls in summer-time in Australia! Snowflakes in summer? Ha! I guess somehow Christmas and snow are intrinsically linked, even for us down-under! (If you are interested, you can find more Christmas science projects here.)
Homemade crystal ornaments do look amazing hanging on your Christmas tree. (I have some pics of them on the tree, but they’re still on my camera. I’ll add them when I get a chance!)
We went a bit crystal crazy this year – it seems we’ve amassed quite a DIY Christmas crystal decorations collection! (And this pic below doesn’t even include the crystal candy canes that we made last year!)
You can see all our crystal activities on Crystal Science page. Yes, we are officially crystal-obsessed. 🙂
While we are on the topic, just a quick note about storage. Because Borax is a salt, the crystals will eventually dehydrate, and start to crumble back into a white (or perhaps blue!) powder. This is a slow process – but it is starting to happen to some crystals we made about 2 years ago, and I’d like our Christmas crystals to last longer than that! So, in an attempt to slow down this process, I’m trialing storing our crystal Christmas ornaments in a zip lock bag between seasons to prevent moisture loss. I’ll let you know how they go!
You might also be interested in our Go Science Girls and Crystal Science boards on Pinterest.
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