Toll suitable for experiments with children!

We bought these tubes for a Science Day in the class of our eldest daughter. Since they are made of polystyrene, one needs to worry that what could break (unless you climb on it). The children were able to mix in different colors of water and then overlaying with oil. As stubble are, the children were then able to take the test tubes with home, which was a very nice gift.
The glasses are completely transparent and not milky. However, they can not be used if you wish to use solvents such as acetone, methylene chloride or ethyl acetate - for then better glass.