4M 7 Crystal Growing Science Experimental Kit with Display Cases - Easy DIY STEM Toy Lab Experiment Specimens, Educational Gift for Kids, Teens, Boys & Girls

I bought this 4M 7 Crystal Growing Science Experimental kit for my 12-year-old niece, and it's been a huge hit! The kit is easy to follow, and the crystals turned out beautifully. She's now hooked on science experiments and can't wait to try more. The kit is well-designed, safe, and perfect for young teens. Highly recommend for a fun and educational experience!

This set is AWESOME! I highly recommend it! I purchased it to grow crystals in the office as a fun experiment to keep me entertained during busy season and it did not disappoint. You need to be sure to follow the instructions carefully. I made a fatal error on my first attempt and did not wait the full 30 minutes before I added the crystal seeding and nothing ended up growing. On the subsequent attempts I followed the instructions to a T and was able to grow beautiful crystals. I even ordered a second set because the results were astounding.The steps are simple enough I was able to grow these in my office with ease. All you need is boiling water and the rest is provided in the kit. The first step is to dissolve the crystal mixture (it looks almost like sugar) into hot water. Next, you have to let it sit for 15 minutes, and then transfer it into a clear plastic container where the crystal will grow. WAIT ANOTHER 30 MINUTES after the water is transferred. This step is crucial otherwise the crystals will not grow.Once you have waited the allotted time you drop in the crystal seeds. They provide blue, red, and white crystals so you can mix and match them to create different colored crystals. It seems that each type of crystal seed grows a different shape of crystal. I noticed that the red crystal seeds will grow more block-like crystals whereas the blue seeds will create more sharp/pointy crystals that flower out. Blue and red will create a crystal that looks like a combination between the two - it flowers out but is more block-like. Keep this in mind when you choose the colors you make.You will start seeing growth overnight. Its amazing to watch the progress. On the instructions it says it takes 4-7 days before the crystals are fully grown. I would keep an eye on them and drain the water when the crystal is about to emerge from the water. If you leave it too long the crystal is exposed to the air it will form "snow-like" growths on the top (which I think are ugly). The rate of growth will be affected by the temperature of the room as well as the size of the crystal you are growing. The crystals grow well in warmer temperatures. The small crystals will finish growing faster than the large ones.Each bag of crystal mixture can either make 1 large one, 2 medium sized one, or 4 small ones. The kit allows you to grow 1 large crystal, 2 medium crystals, and 4 small crystals simultaneously because that is the amount of containers they provide. If you want to grow 3 large ones you can grow them one at a time because they only provide one large container. I think the large crystals are the coolest.All in all this is an amazing kit. Everyone in the office is jealous and now they want to grow their own crystals too. 5 stars!!! I want to make ALL the crystals!

Kind of false advertising. It says 3 crystals, but the kit has one container, one packet of crystal mix, and 3 packets to select the color by various combinations. The bigger kits seem to really make 7 and 10 crystals. So while the kit is fun, it is a one and done, so know that before you choose this over the other sets.

These were really easy to make and a very intriguing thing to monitor as they grow! Definitely not exciting at first but patience as a few days go by is worth it!

This was so much more fun than I'd anticipated! I got it for my kids, ages 3-11, for Christmas. It was a bit fussy to do- make sure you read through the directions carefully, use an instant-read thermometer if you have one, and set the timer. I used regular tap water and it worked great. The kids (and I) had so much fun checking on then each morning and night! Some observations: The crystals grow very fast up to the small size, then growth slows down significantly. Red crystals grow the slowest and form that chunkier shape, whereas blue and white grow faster and are more pointy. The largest size is only marginally taller than the smallest; since the large crystal takes so much longer to grow more liquid evaporates, thus decreasing the final height of the large crystal. The small crystals only took about 3-4 days to form, whereas the large crystal took about 2 weeks in a 72-degree home. Take them out as soon as they touch the surface of the liquid or they'll start to flower out. As long as your ratios add up, you can mix any combination of colors. Our large light purple crystal was 1 part red, 1 part blue, 2 parts white. I would even decrease the colors to 1/2 parts and up the white to 3 in the future. Have fun with it!