My LST Fastfloat has turned dark blue / grey / black. What causes this, is the LST Fastfloat damaged, and how can I get the heavy liquid back to its original state?
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 accum
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