These are most of the ingredients (www.adityabirlachemicals.com/brands/pdf/TetraMate_35.pdf):
Acidity As H2SO4 (0.03%, max)
Tin (10ppm, max)
Phosphate as PO4 (50ppm, max)
Iron (0.5ppm, max)
Lead (1ppm, max)
Chloride (1ppm, max)
Nitrate (100ppm, max)
I did some research. I found that only lead is toxic, but even lipsticks have 1-5 ppm of lead. It seems harmless to consume the product after much dilution.
If the product isn't good enough for internal use, is it suitable for topically use?