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1,2-Propanediol - The primary ingredient in aircraft anti-freeze and automotive anti-freeze. Used as the killing and preserving agent in pitfall traps, usually used to capture ground beetles. Mixing anti-freeze with heavy metals (iron, cobalt, copper, manganese, molybdenum, zinc, mercury, plutonium, lead, arsenic, aluminium, mercury, cadmium... see list of ingredients spewed by the volcanic oil gusher) makes it very toxic. Not recommended for your aquarium. Don't try going to a sushi restaurant, get salmon eggs, tobiko or uni and start soaking them in anti-freeze.
Butanedioic acid, 2-sulfo-, 1,4-bis(2-ethylhexyl) ester, sodium salt (1:1) - Animal studies on rats and rabbits show depression, diarrhea, lethargy, irritation and hemorrhage of the gastrointestinal tract, erythema, edema, premature skin death, malformed fetuses, irritation, coarse skin and of course - death! Oh... it kills fish!