Which of the following is a danger from lead-tin solder?
Lead can contaminate food if hands are not washed carefully after handling the solder✓Correct answer
High voltages can cause lead-tin solder to disintegrate suddenly
Tin in the solder can “cold flow,” causing shorts in the circuit
RF energy can convert the lead into a poisonous gas
Explanation
Lead is a cumulative toxin and the practical exposure route when handling solder is ingestion, when residue transferred to the hands reaches the mouth or food. Washing hands after handling solder removes that residue. The other choices describe effects that do not occur.