Since my last post was moderated for bashing the grammar police there which this is really a personal attack from said dork from a previous post. I will re-upload the pic of me in my truck parked under a water tank we sandblasted and painted as one of the many lead abatement contracts I worked in back in my 20's, and I'm sure I could find a bunch more pics.
Today boys & girls were all going to learn how to research and read before we just spout bs to someone in need!
"Lead-free solders have been increasing in use due to regulatory requirements plus the health and environmental benefits of avoiding lead-based electronic components. They are almost exclusively used today in consumer electronics" - Wikipedia
"Flux is a reducing agent designed to help reduce (return oxidized metals to their metallic state) metal oxides at the points of contact to improve the electrical connection and mechanical strength. The two principal types of flux are acid flux (sometimes called "active flux"), used for metal mending and plumbing, and rosin flux (sometimes called "passive flux"), used in electronics, where the corrosiveness of the vapors released when acid flux is heated would risk damaging delicate circuitry.
Due to concerns over atmospheric pollution and hazardous waste disposal, the electronics industry has been gradually shifting from rosin flux to water-soluble flux, which can be removed with deionized water and detergent, instead of hydrocarbon solvents.
In contrast to using traditional bars or coiled wires of all-metal solder and manually applying flux to the parts being joined, much hand soldering since the mid-20th century has used flux-core solder. This is manufactured as a coiled wire of solder, with one or more continuous bodies of non-acid flux embedded lengthwise inside it. As the solder melts onto the joint, it frees the flux and releases that on it as well." - Wikipedia