Aha!Should be ok with several types of diamagnetic metals - we use several copper components in the SQUID, which goes up to 5 Tesla. Also, you can make very sharp blades with certain polymers - apparently used by spies and the like as they don't really show on X-rays well.
(
Colonel Boris "...a desperate Buzzfeed imitation...",
Wed 24 Feb 2010, 10:43,
archived)