National GeographicJM00632 Purple Grow Crystal Growiing Kit

Worked very well

I’m rating this 3 stars because the photo is very misleading. If you ask my children, they’d rate it 5 because they loved watching the crystals grow. The crystals you grow out of this set do glow in the dark indeed. If you e ever done crystal growing before, you know the shape will be super cool but it won’t look like the stock photo. Go in with an open mind and no expectations. The crystals will turn out colorless transparent, not green. They’ll glow like those glow in the dark star stickers you can buy to stick on the ceiling. Definitely keep a large tray under the jars because tiny layers of crystals will grow out of the jar and onto the surface, basically wherever you may have touched even slightly while mixing the powder with water. It easily washes off from a stone countertop but I wouldn’t risk it. We used a large, plastic Ikea tray. The set comes with two real crystals which do not glow in the dark. They’re still cool though. I’m taking the average of my rating of 3 and my kids’ rating of 5 and rating this 4. Just lower your expectations and follow the instructions very carefully. Leave the jars in a place nobody will touch them. Longer you leave them, larger the crystals be. At least 2 weeks in our experience. Don’t cave and take them out earlier. You can still observe the growth if the jars are transparent. Be patient and enjoy!

Didn’t work despite following up the instructions

After my child waited patiently and followed the instructions, it didn't work. Definitely not worth its value and disappointed.

No crystals inside!

waste of money

Tal como indica la descripción, recibimos dos unidades (piedras). Los cristales son pequeños pero son muy bonitos y los niños disfrutaron abriéndolas…eso sí, recomendamos ayudarles y paciencia para conseguir partirlas/abrirlas en dos mitades lo más grandes posible.

Einfach anzusetzen. Kristall leuchtet im Dunkeln,Schade nur englische Beschreibung,aber mit Bildern zu verstehen,haben uns zusätzlich ein Video im Netz gesucht

Great gift for a 10 year old if your not sure what to get them.

Abbiamo acquistato il cristallo di colore verde ma è arrivato quello incolore. Però in compenso il cristallo è cresciuto bene, a differenza di altri kit comprati.

We grew this in a jam jar over 2-3 months, amazing patterns on the outside. When it came time to remove the crystal we simply scored around the widest part of the base of the jar and heat shocked the jar and gave a tap and out it popped.