Hi
Thanks for sharing and posting the photos.
The Pure Food and Drug Act of 1906 required companies to list their ingredients and it had the affect of putting many out of business. Some changed their formulations to be more acceptable.
Looks like your bottle is not machine made (mold seam stops before getting to lip) so it most likely dates before about 1910.
The iridescence (carnival glass appearance as you say) is caused by leaching or dissolving of a portion of the glass at the surface. It commonly happens to bottles / glass buried in the ground. It appears the glass color is pale aqua.