Just went and looked at my bottle,........warnings are posted on it,........but that is on pretty much any bottle so for whatever that is worth,
Scott,.......I definitely get your point on expense but I guess I really don't think that much about it. After everything I've used it for (not all of it posted here ) I have over 2/3 of a bottle left. I think it really goes a long way.,,,,,,,,,,and compared to other stains,, seems to be competitive. However, if they use this stuff for high school chemistry or something like that and a supplier can be found I'm sure your right and it can be bought by the lb. for little of nothing.
FYI :I have an aniline dye ( 8 oz.) that I'm fixing to order that is $43 on amazon. Now yes sir I think that is pretty darn expensive lol. But I liked the results I seen posted on it and plan to give it a shot.