I want to know the answer to the following question:
What alloy can no longer be used in HASL because of restrictions on the use of one of its metal components?
All the background I'm provided with is that "This solder was a tin-lead alloy, however new solder compounds are now used to achieve compliance with the RoHS directive in the EU and US, which restricts the use of lead.". Is that enough to answer the question?