Are you painting the outside of the jars? I think you can use any enamel paint. Martha Stewart has a paint called "Liquid Fill" that results in a colored glass effect. You can also bake glass (search directions on that) to set the paint you use. Here's a link I found with some basic info.
It looks like there are quite a few methods, painting the inside or the outside, tinting,etc... heres a few articles, hopefully one will have what your looking for