Keeping this TC related..
Both Sr and Li salts make for red sparks, but the color is distinctly
different. I used to soak tennis balls in various salt solutions and
use them as ground strike targets and/or suspend them in a jacob's
ladder.
These days, finding out what ions make what colors and how to get blue
without antimony is the work of a few minutes googling.
I don't know that there's any real difference in availability between
SrCl2 and LiCl. Li salts might be less toxic (chemically similar to
Na and K, after all). The nitrate salts also work, and have the
advantage of having some oxygen in the mix. You have to look up the
solubilities.
Li metal is something that is very difficult to get a hold of without
attracting attention, because it's used in methamphetamine synthesis.
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