Vintage Pyrex Measuring Cup Borosilicate Vs. Soda Lime Color Difference?
The destructive test for borosilicate or not is as easy as fill with boiling water, wait a while for it to heat up, dump the boiling water, fill with ice. If it breaks, it's probably not borosilicate.

On the other hand, any tint is a probable indicator that it's NOT borosilicate, which has a very flat transmission characteristic in the visible range.

If you really want to get into the nitty gritty you can mix up some refractive index matching fluid, submerse the measuring cups, and see if they "disappear" - which seems to be a common means of testing for borosilicate, as it has a different index of refraction from quartz or soda-lime glass.

You can use a known borosilicate to help get the solution correct.

http://gr5.org/index_of_refraction/