Dunno if this helps anyone, but sn is used for lots of things other than curing meat.
Curing is possibly the worst excuse to use as it needs such a low concentration of sn (ie food grade, not lab grade).
Here is a fairly comprehensive list from a BASF MSDS doc. Textile dying or technical uses would seem quite plausible for lab grade sn.
In the food industry
Sodium Nitrite for Pickling Salt (E 250) may be employed as a preservative for the production of nitrite pickling salt only in accordance with the provisions of the permitted additives regulations, EC Directive 95/2 or the Code of Federal Regulations (21 CFR) of the Food and Drug Administration or other local guidelines – restricted to a few foods and in the maximum amounts specified there.
In the chemical and pharmaceutical industries
For the manufacture of azo dyes, diazo compounds and nitroso isonitroso compounds. For flushing butadiene tanks and as a component of heat transfer salts.
In textile dyeing and printing
For diazotisation in the manufacture of azo dyes. For oxidising dyeings and prints with leuco vat dyes. To protect against overreduction in dyeing and printing with certain vat dyes. For the accelerated oxidation of vat dyes that are difficult to reoxidise. For bleaching natural fibres.
In the metal industry
As an accelerator in cold phosphating. For the production of baths for the bluing of steels. For the bronzing and quenching of steel. In descaling steels and cast iron. As an additive to alkaline pickling baths for aluminium and aluminium alloys and for neutral cleaning and passivating baths. As an auxiliary in the treatment of tinplate.
In the construction industry
As an additive in the manufacture of concrete to increase its strength and as a corrosion inhibitor in reinforced steel.
As a corrosion inhibitor for iron, steel and water cooling circuit systems.
In the rubber industry
As an auxiliary for the production of rubber as hardener, accelerator, retarder and anti-ozonant.
In the chemical-technical industry
For the manufacture of corrosion inhibitors and corrosion-inhibiting papers. In the manufacture of aqueous emulsion paints. As an additive to enamel frits and for the manufacture of products for preventing corrosion of heating oil storage tanks. In cutting and drilling oils, in hydraulic fluids and in lubricants. In the oil industry.
For stabilising the colour of vinyl resins.
. Will be careful in future.
