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 -  Monday, September 14, 2009
Worked Great for my Cub Scouts!
Reviewed By: Hilda 
After reading all of the reviews I went ahead and tried this with my cub scout den as part of our Geology Pin requirements. We used a glass bowl, and we covered the rock about 3/4 of the way leaving some dry rock at the top. I gave them the option of adding food coloring at home, which me and my son did, and it worked great. Very happy with this product.

 -  Monday, January 05, 2009
nice project
 
This project was fun. My son loved watching more crystals grow every day. I made the mistake of using a plastic bowl that I wanted to use again. Crystals also grew on the bowl. We have saved the rocks with the crystals on them.

 -  Sunday, July 27, 2008
GREAT
Reviewed By: Susan 
This worked great and more quickly than I expected. The kids loved it. My only questions was whether we should add more vinegar after it evaporated. It evaporated after just a week or so.

 -  Saturday, June 14, 2008
Complete Flop
Reviewed By: Tim 
The directions were simple as the previous commenter stated. Despite this, the product didn't work as advertised. In fact, it didn't work AT ALL. Don't buy this product. Home Science Tools should remove it from inventory and save its customers some money. ***Home Science Tools adds: We re-tested this product and were able to grow crystals in 24 hours. We assume this problem was caused by covering the rock with vinegar rather than leaving part of the rock exposed to air. Crystals will not form if the rock is covered with vinegar. To prevent confusion in the future, we've updated the manufacturer's directions for this product.

 -  Tuesday, March 25, 2008
This was a fun project
 
The directions on the package could be better. This did not do well in the foil pans that we first put the rocks and vinegar in. However, when we changed the same rocks to glass pie plates we had wonderful crystals to observe after the vinegar evaporated. I found that putting the pie plates outside in the sun speed up the entire process by several days. The kids had fun with this project and can't wait to show off what they did at the next science club meeting.

Read More Reviews

-  Thursday, March 15, 2007 Disappointing   We couldn't get this to work. The instructions are simple and minimal so no trouble shooting. At least it was cheap.