PDS / lead or lead-free solder?

Soldering the led matrix together.

Suddenly, soldering iron tip stops getting hot. Uh-oh… tips oxidized

Progress halted till new tips

Googled “how to prevent soldering iron tips oxidation”

Found the lead vs lead-free solder

https://www.quora.com/What-are-the-disadvantages-of-lead-free-solder-vs-lead-solder

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