How to fix a thin chip in the enamel(?) of the bathtub?

Not sure sure what tubs are made of, but we need to fix a spot that was chipped off. It's shaped like an ice cream cone only it's less than an inch long. Is there a type of paint or something inexpensive I can buy and touch it up? It's a white tub, if that helps.

Answers:
go to a hardware store and buy some touch up paint.Sand the area real carefully because the edges of the chipped area can be very sharp, then touch it up with the paint and let it dry overnight

Other answers:
There is an enamal "paste" you can use. Available at Lowe's/Home Depot, just ask when you get there.
There is an enamal "paste" you can use. Available at Lowe's/Home Depot, just ask when you get there.
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