Glass blowing, if you didn't know, is the art of working with molten fucking glass to make your very own glass containers. Oh, and you do it by blowing into a wad of molten glass with your mouth. Bizarre as it sounds, glass blowing was considered a useful skill for a young man to have half a century ago. Universities actually required chemistry students to make their own test tubes, once they were done carving their desks out of lumber.
They'll be fine if they don't inhale. Or slip.
Keep in mind that in order to be able to change the shape of the glass, first it has to reach its softening point, which is around 1,000 degrees Fahrenheit. The Gilbert Glass Blowing Set encouraged children to try this with their bare hands in order to carry out a series of wildly irresponsible experiments detailed in the manual:
We did find that when the glass becomes red hot it removes all the skin from our hands.