My LST Heavy Liquid has turned dark blue/grey/black. What causes this, is the LST Heavy Liquid damaged, and how can I get the LST Heavy Liquid back to the original state?

The blue colouration is a well known chemical reaction which polytungstates can undergo when chemically reduced. The reduced compounds are sometimes called the ‘heteropoly blues’. This can occur when a reducing agent comes in contact with the heavy liquid.

At high temperatures, such as might occur if the heavy liquid crystallised on a hotplate, even dust/dirt can sometimes act as a reducing agent. You can also get this colour if the LST Heavy Liquid is contaminated by contact with iron. There are two ways to get rid of the dark colour.

The easiest way when dealing with small quantities is to add a few drops of 30% hydrogen peroxide solution H2O2) to re-oxidise the LST Heavy Liquid. You don’t need to overdo the addition of hydrogen peroxide. Typically you need add no more than 1 mL of 30% (H2O2) for every 200 mL of affected LST Heavy Liquid, but it will depend on how much reduction there is.

You can then heat the discoloured LST Heavy Liquid and hydrogen peroxide at about 80oC to make ... more.

The blue colouration is a well known chemical reaction which polytungstates and heteropolytungstates can undergo when chemically reduced, i.e. When the heavy liquid gains electrons from a metal or other similar reducing agent. At high temperatures, such as might occur if the heavy liquid crystallised on a hotplate, even carbon, dust or dirt can sometimes act as a reducing agent.

It occurs most commonly when the heavy liquid is contaminated by contact with iron. The easiest way to remove the dark blue colour is to add a few drops of 30% hydrogen peroxide solution (H2O2) to re-oxidise the heavy liquid. Normally no more than 1 mL of 30% H2O2 should be added to every 200 mL of affected LST Fastfloat.

The discoloured heavy liquid and hydrogen peroxide is then warmed to about 80-90 °C to remove the colour. It is normal for the heavy liquid to effervesce during the process. To remove the colour from large quantities of heavy liquid, especially to remove the dark brown which is caused by ... more.

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