... acid is a kind of colorless, smoking, inflammable liquid with irritant odor and very strong corrosiveness and can be ... 93) Specification: Re: Formic acid 90% tech grade Appearance: Colourless liquid Specification: Purity: 90% min Colour Index Platinium Cobalt: 10 ... .006% max Re: Formic acid 85% tech grade Appearance: Colourless liquid Specification: Purity: 85% min Colour Index Platinium Cobalt: 20 ...