Blue MarbleNATIONAL GEOGRAPHIC Kids Crystal Growing Kit - Grow 6 Crystal Trees in Just 6 Hours, Educational STEM Craft Kit with Art Supplies and Geode Specimen

I did not have high hopes after reading some of the reviews, but the whole family actually liked them! 2 kids, 2 parents and grandma each made one. You color a paper tree with markers. As you can see in the pictures, only the blue and purple markers really showed up. (Maybe try using other markers?) We did them around 8 p.m. The crystals started growing after about 45 minutes, and we were all surprised at how cool they were the next morning. I think one of the key things is to wet the tops of the trees with the crystal solution. As others have said, this is a throw away project - the crystals are not sturdy enough to keep.

It produces a good result as advertised and grows quickly which is great for impatient kiddies. It starts growing within 30 minutes and is almost fully grown after a few hours. The downside is the growth is extremely fragile and a lot of the growth falls off on its own without touching it (photo). If you touch the trees or knock them even slightly, a lot of the “cauliflower” growth falls off so not great for kids who expect to be able to handle and examine them often they’re grown.Update: The vendor reached out to us and gave a full refund because we were disappointed with this product which pleasantly surprised us. We have bought several other National Geographic kits in the past and have been very pleased with them. This was the only one that was a little disappointing.

Good product. Highly recommended.

Franchement il faudrait 10 fois plus de produit pour que ça marche vraiment.

Para un niño de 8-10 años es recomendable, incluso 7. Lo que menos me gusta es que el cristal se deshace fácilmente y en un par de días el árbol estaba medio deshecho. Su uso es sencillo y no tiene dificultad, paciencia y esperar. Es muy bonito ver y hacer el proceso de formación de los cristales.