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Persistent blue

 

In the following video we see as a basic solution of methylene blue discolored in seconds by adding glucose, which acts as a reducer. However, to stir the dissolution the bluish color returns to recover because the reduced form is oxidized again to blue methylene with atmospheric oxygen.

diagrama azul persistente

When the dissolution remains without agitation for a few seconds the dissolved oxygen it is consumed quickly and glucose reduces to the colorless form methylene blue. It is enough to stir a few seconds so the oxygen dissolves and again to look like the color blue due to oxidized form.

 

azul persistente 1 azul persistente 2

 

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