Hi all.
Got this old solder, melts well very easy and quick. Never used it before. Never knew existed. Lead free. Not flux cored, applied flux, flows like a river... Perhaps intended also for plumbing, do not care.

 

Google AI summary:

Yes, antimony (Sb) is toxic and can be harmful to the eyes, skin, lungs, heart, and stomach. It can also affect the cardiovascular, developmental, gastrointestinal, hepatic, and respiratory systems, and may cause cancer

From a book about poisons:

Gram-for-gram, antimony is about as toxic as arsenic

Though it goes on to say that it is not as dangerous because the body eliminates it quickly, in fact is was used to induce vomitiing.

So, not much of an improvement over lead.