May I break in here? I'm thinkng that I've read that use of
Pt in commercial jewelry began when acetylene was introduced (ca
1910?) because it could produce the high temperatures needed for
soldering the Pt. Ias this correct? If so, what did these folks
do to prevent the brittleness? Or am I thinking of the advent of
bottled oxygen or of natural gas mains in cities?
hi Roy (Jess),
i would’nt know if this is true or not. what i do ascertain is
that contamination of platinum by acetylene wasn’t known until
relatively recently. oppi untracht recommends the use of acetylene
for plat in his jewelry concepts and tech. i think it was
published pre 1985. to a certain extent, i’m told, that propane
also contaminates metal, but not as proliferously as acetylene.
propane can cause microporosity in plat castings. i have tried
(bottled) hydrogen, and my limited experience with it is that it
does indeed produce cleaner castings, but a bottle of it goes
very quickly. i went back to propane for cost factor
conssiderations. the difference of heat and cleanliness of fuel,
for my applications, was marginal.