I once bought a spool of string that had a prop65 warning on it. It's true the warnings are useless, because they don't list the harmful ingredient (lead conta

I once bought a spool of string that had a prop65 warning on it. It's true the warnings are useless, because they don't list the harmful ingredient (lead contamination? outgassing of plastic additives?) and they don't say what activities are risky (can this spool of string cause problems if I don't touch it?)