As the equation above shows, MB, which, in its oxidized form is blue, becomes leucomethylene blue (LMB), and turns clear when reduced by the reaction with H2. The diagrams below show how the reaction between H2 and MB changes the structure of the MB molecule:

​​​How does H2Blue detect dissolved hydrogen gas?

H2Blue uses Methylene blue (MB), a compound commonly used in chemistry as an indicator and in medicine as a biological tissue dye, to detect dissolved H2 gas. As an oxidizing agent, MB is known to react with dissolved molecular hydrogen to produce the clear (reduced) form of MB, leucomethylene blue (leucoMB), as follows:

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A note about using methylene blue as an indicator for dissolved H2 gas:

H2Blue contains a common dye, methylene blue, a compound used in biological applications. But, a solution containing only methylene blue is not an effective dissolved H2 indicator. For methylene blue to be used as an indicator for H2, the addition of a catalyst is necessary. The catalyst is, by weight, the most expensive component in H2Blue.