I bought the size 2 (post pregnancy) in cyan color. I had to trim the stem and thought I'd do a burn test on the part I cut off. I am happy to report that it passed with flying colors: no melting, deformity, or stickiness, just gray/white ash.
Thanks to all who make this site great!
To the admin: Wasn't sure exactly where to tag this since there isn't a Rainbow tag. Please move this if I messed up. Thanks!