Zoe, I'm most certainly not an expert, but I know some things about
aluminum that may help you.
You can solder aluminum, but not aluminum oxide - and raw aluminum
almost immediately oxidizes as soon as you stop exposing fresh metal.
The process of soldering involves cleaning as you apply solder. Using
a stainless brush to scrub the aluminum with melted aluminum solder
and heat is the surest way I know. This provides a "tinned" surface
that will join to another "tinned" surface. It's not trivial.
Aluminum alloys vary widely in composition, and people vary widely
in their reaction to metals. I know of people that are "allergic" to
nickel, copper (and therefore brass), stainless steel (possibly
nickel alloy), "base metal", pewter and zinc. I also know people that
wear each of these as jewelry without rashes or allergic
It would seem that pierced ear loops or finger rings would be more
likely to cause problems than a bracelet, because the exposure to the
metal is more intimate.
From Machinery's Handbook, the typical wrought aluminum alloy
elements are Cu, Si, Mn, Mg, Cr, and other - in some cases, other is
a significant part of the alloy.
If you can produce good jewelry or statuary, and clearly label the
composition of your pieces, you will have to assume that the
customer has some judgement about their own relative allergic
reactions. I personally have a bit of trouble with grocery store
basket handles causing a rash by the time I fill it with groceries -
but I play with a lot of aluminum of varying alloys and haven't
noticed a problem. On the other hand, I don't cook with raw aluminum
pots, because the link between Alzheimer's and aluminum is a bit
muddy - there are conflicting claims.
Now, was that close enough to a fence sitting position?