BGA chip re-balling / re-soldering service UK?

[Khron]

Flux is just flux; solder paste is fine solder pellets suspended in flux.

https://en.m.wikipedia.org/wiki/Flux_(metallurgy)

 

[JohnRoberts]

Back last century at Peavey we has an xray machine in the SMD production area...

I tried to use it once to look inside electrolytic capacitors and it wasn't very useful for that.

JR