In message , Ian Wade
writes
I am looking into the possibility of buying a kit to assemble, but have
come across this statement in the warranty Ts and Cs:

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The use of acid-core solder, water-soluble flux solder, or any
corrosive or conductive flux or solvent will void this warranty in its
entirety.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

My current reel of no-name solder is several years old, and I have no
idea whether it complies or not (but I suspect not).

What kind of solder should one use these days?

Hi Ian,
It may or may not help, but this is a subject that comes up regularly on
the Elecraft reflector. So much so they have a separate section on the
web site. See if this helps:
http://www.elecraft.com/solder_sources.htm
Trev G3ZYY
--
Trevor Day
UKSMG #217
www.uksmg.org