Griff:
Check out this page at [Coloured Smoke]
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Hi,
>Attempted to colour smoke on my plane with a smoke unit.
>Used food colouring as recommended, red and blue but hardly noticed the
>difference - still looked white..
>Just what ratio of colour to diesel oil is required for a good colour?
>Is food colouring the best stuff?
>
>Thanks guys.
>
>Griff.