National Geographic Jumbo Crystal Growing Kit - Grow Your Own Giant Glow in The Dark Crystal in a Few Days, Science Kit, Grow Crystals for Kids, STEM Toys (Amazon Exclusive)

Follow my guide 1. Follow their traditional instructions 2. Once u have a good grow with crystals covering the whole stone and it's not falling apart remove it 3. Chip off undesired edges of growth 4 save all the current water salt solution and chip off any dried salt/crystals from the edges of cup or bowl and take a small pan pour all that into pot and heat it and stir till all is liquid and pour that back in the cup or container you were using to grow but do not put the stone with the leftover grown crystals in until it's warm (WARM) 5. Repeat this process till it looks like mine After this kit I just ordered alum from Amazon and started growing my own crystals with out needing a kit anymore .

This is fun for kids to play and watch grow.

Like some of the other reviews I also did have issues with dissolving this powder into the amount of liquid they suggested. Got it to mostly work. They were small and grew all over the container, but I managed to chip out a few good pieces. As far as I can tell they don’t really glow, but still had fun.

No. The results weren't even close. I tried the default instructions and read advice from others. They (2 kits) were supposed to be featured in a new modern art concept. The end results were pathetic! See the picture for the end results.

Great fun watching the crystals grow! Good for all ages, as adult doing this with my son found it entertaining to watch. Follow the instructions and use the appropriate size container. Would definitely buy it again.

I really enjoy how my crystal growth turned out. This product is designed for children but as an adult I'm not entirely sure I followed the instructions properly. I was definitely expecting more of a single rock like structure but my crystal ended up taking the shape of the bowl I put it in. At first I didn't think the crystal would come out of the glass bowl I grew it in but with just a little poking it came free. It takes several days for the crystal to complete it's growth and it's kind of fun to watch the progress.

This is a "jumbo" version of the normal NatGeo set that's sold in stores. It comes with three times the powder stuff so that it can make a bigger crystal. My issue is that the instructions that came with it were identical to the small set, right down to the amount of water to use. I was skeptical, but my kiddo and I followed said instructions perfectly, because it's all about being precise and learning science. I figured maybe it was supposed to have a higher concentration. Unfortunately, we stirred and stirred for ten straight minutes in the hot water and couldn't get it to dissolve entirely--it was physically impossible. We ended up having to transfer to a much bigger container than it said and having to add more water and more water until (go figure) the concentration from the original set was reached. Then it dissolved no problem. Unfortunately, by then, we were half an hour into stirring this stuff, and kiddo was frustrated that we weren't following instructions and things weren't working. It took all the fun out of it. It should also be noted that you need a big glass mixing bowl for this. The stuff seems to wash out okay after you're finished, but plan on a BIG vessel. It doesn't come with anything to use. Also, the crystal itself doesn't glow, and especially not like the photo. The "seed rock" glows a bit, but the crystal you grow on it is just clear. Bit of false advertising there. It's cool stuff... why are they deceptive about additional features? Overall, this was super frustrating. I expect more from NatGeo. Some of these kits have been really fun and cool, and others have been complete busts for one reason or another. They need to do more testing and quality control on their end before releasing products.

My son was so excited to be able to grow his own crystal and that it would be able to glow in the dark. Well a few days after it arrived, he wasn’t disappointed. The crystal was large and it did indeed glow in the dark. The only drawback was the lack of instructions regarding the extra rock/crystal that was included in the kit. We now think it was just a keepsake but he put it on the crystal starter and it integrated into his new crystal. Otherwise the booklet was helpful/informative, but some graphics may have cleared up his confusion. The glow in the dark feature is subtle but he still really liked it. Lastly, the shards are sharp so everyone needs to be careful handling it.

My brother loved this rock set . Very nice for kids.

No sirve. Evitense el gasto y la desilusión de sus hijos

Did not grow as big as it said

This comes with the standard size crystal growing kit instructions but is the jumbo size. You end up putting the wrong amount of water and it leaves the kit basically unusable. You can guess the correct amount of water and try and recover it but at the end of the day it wasn't an enjoyable experience with the kiddo who was initially very excited but was frustrated by the end of the entire experience. Would not buy again.

Ma petite-fille l'a beaucoup aimé.