Those that sell cobalt platinum say it's great. It casts well (which
is why the manufacturers like it), but that's about it. It is
magnetic, which should give you some idea of what it's like to work
with. It is all but impossible to solder or fuse with any degree of
Those that have to work with it will tell you it's a major pain in
the behind. I personally won't touch it unless I absolutely have to.
If you do have to work with it, keep it completely separate from any
other platinum. It can contaminate your 900 Ir or 950 Ru it just like