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From: N_Cook on 14 Apr 2010 07:50
The KI came from a kids chemistry set in a charity shop. One way around kids
and chemistry and product liability, absolutely no name. Nothing on the box
and nothing in the accompanying book for makers name or even country of
origin.

Looks as though regular flicking of the test tube is important.
Repeated samples and again nothing appearing in the non-lead sample. The odd
flecks that would appear when shaken were probably reduced flakes of the
original scrapings, again black colour. Looks as though 30 cu-mm is about
the right amount of KI with 30 cu-mm of solder and initially 3cc of HCl. I
can only estimate using a small spatula that is in fact a stainless steel
lobster pick, fork+spoon. The 4mm wide spoon end is ideal for this. No
orange colour this time (initially) . Once a very slight yellow tinge to the
liquid appears and at boiling and through cooling , much flicking of the
tube with a finger, then instead of flecks that look like golden flakes of
skin you get a dense mass of more like cream-coloured soap flakes. Reheat
and all this dissolves well before boiling point. Allow to cool untouched
and then just a small scattering of fine gold-coloured flecks when you flick
the tube. The orange colour seems to only appear after repeated heating and
cooling, the second SnPb sample is now starting to show this orange colour
after 5 or 6 heat/cooling cycles.
The colour of the residual bits of SnPb solder masked by the
crystals/precipitate , but not obviously black.


From: N_Cook on 21 Apr 2010 03:23
followup
Looks as though the orange colouration is due to tin/stannic iodide, from
the Sn in SnPb and PbF. After a week or so the orange colouration appeared
in the solution in the PbF test tube also.
Even more convincing collection of scintillating gold flecks in the SnPb
test tubes


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