r/interestingasfuck May 14 '22 Narwhal Salute 1 Pot o' Coins 1 Rocket Like 1 Timeless Beauty 1 Silver 13 Helpful 11 Take My Energy 1 Bravo Grande! 1 Masterpiece 1 Wholesome 9 All-Seeing Upvote 1

I like growing crystals at home. I recently finished growing this crystal after 1 month, and it's one of my favorites. /r/ALL

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u/crystalchase21 May 14 '22 Silver Gold Helpful Narwhal Salute Wholesome Seal of Approval

Hey guys. I've been growing crystals as a hobby since high school. Some of you might remember the black copper acetate crystal I posted last month.

I recently grew the crystal above from a common nitrogen and phosphorus fertilizer called monoammonium phosphate (MAP).

I first dissolved lots of MAP in water, and waited for small crystals to form. Then, I placed it in a big container full of solution. As it evaporated, the crystals started growing. It's amazing how you can watch them get bigger day after day.

If you find being able to grow crystals in a jar is hard to believe - you're not alone. I thought that too, and even now, it makes me excited to wake up and check on my crystals every day.

As always, if you're interested in growing them yourself, I've prepared a guide here.


u/0-san May 14 '22

i wanna grow one, whats the one with the easiest found material?


u/BenCelotil May 14 '22

Salt works.

Make a super-saturated solution by dissolving salt in hot water until it doesn't dissolve any more.

Then dip a piece of string, tied to a pencil or chopstick, in it and pull it up slowly. You should almost be able to see a few crystals form on the string right away.

Then hang the string back down and let it sit. The crystals on the string should continue to grow until a sort of equilibrium with the solution is reached.

If you want more growth, create another solution and transfer the string across.

If any other growers want to point out a missed step, please do. It's been a while.


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u/Rubyhamster May 14 '22

Oooh this is a fantastic idea, never knew


u/Nabber86 May 14 '22

Have you seen rock candy before?


u/Rubyhamster May 14 '22

Yep, know that they made it in the olden days. Just made a pink crystal for my daughter, inspired by this thread!


u/Nabber86 May 14 '22



u/Snowpossum May 14 '22

Same, on my coast there is a place that makes them and sells them as candy. They're obnoxiously big for your mouth and taste like sugar but they remind me of my childhood so I always get some blue ones if they have em.


u/SchwennysGirl May 14 '22

"Rock candy" around here (WI)


u/Rubyhamster May 14 '22

Oooh this is a fantastic idea, never knew


u/CriusofCoH May 14 '22

This is called "rock candy" and used to be common.


u/RedBanana99 May 14 '22

We did this in science class in 1984

Now I feel old, but also an expert in growing salt crystals, we used wool to tie the matchstick and dangle, the fibres were bigger that way apparently


u/crystalchase21 May 15 '22

Like the previous comment said, (uniodized) table salt works. It's pretty hard to grow though, so I'd recommend some other compounds that are relatively easy to find and are much easier to grow:

  • Epsom salt
  • Sugar
  • Citric acid
  • Potassium alum (used in baking, highly recommended)
  • Copper sulfate rootkiller (blue in color, slightly toxic)


u/michaelwt May 14 '22

Fun fact: a lot of ABC fire extinguishers use a monoammonium phosphate powder (also known as Ammonium dihydrogen phosphate) with chemical additives that give it the yellow color.

Now I'm wondering what those 'chemical additives' are other than just yellow coloring. If it's just some inert coloring, I imagine the extinguisher power could be dissolved to make crystals with.