> it is quite a bit darker than the tech grade
and has a red color to it.the red color indicates Br2, that easily adds to the
double-bond of safrole forming the dibromide and
eventually also brominates in a minior side-reaction
the aromatic ring.
to destroy the Br2 in the homemade HBr/GAA, i suggest
to add some vanillin, that probably under these conditions
will bind the bromine and retransform one half of it
back to the desired HBr:
vanillin + Br2 --> 5-Br-vanillin + HBr
see also
None
(
https://www.thevespiary.org/rhodium/Rhodium/chemistry/mmda.mescaline.html)
there's also a good chance to destroy the bromine simply
with a bit vitamin C (ascorbic acid).
see
AscorbicAcidTitration
(
http://www.cofc.edu/~kinard/221LCHEM/AscorbicAcidTitration.PDF) :
AscAcid + Br2 --> DehydroAscAcid + 2Br(-) + 2H(+)
but i don't know if ascorbic acid is soluble in HBr/GAA,
and it could also happen that the excess HBr adds to
the double-bond of the ascorbic acid before the Br2 does.
and especially at an elevated temp the HBr could brominate
the OH-groups of the ascorbic acid.
but nevertheless it should be worth a try.
since both suggestions are just theoretical and NOT tested,
i recomend first to make some tests in a test tube.