Which rubber fish do not contain toxic plasticizers?

"The corrosive effect of alkalis is much more dangerous to humans than that of acids, because human skin itself contains an acid and is therefore more accustomed to acids. Even a splash of diluted caustic soda in the eye can cause blindness. Alkalis feel soapy and taste bitter." Source: https://www.seilnacht.com/Lexikon/Laugen.htm#:~:text=The%20%C3%A4tzende%20Effectiveness%20der%20Laugen,Auge%20can%20zu r%20blindness%20f%C3%BChren.&text=lye%20f%C3%BChlen%20be%20soapy%20an%2C%20the%20taste%20is%20bitter.