Rob McPhee
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Countrycara's requirement was for orange smoke. The temperature required is a lot lower than is required for Iron Oxide and being in a gaseous form rather than particulate form would produce a much greater quantity of "coloured smoke".
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Iron oxide would be totally unsuitable as it doesn't sublime. For orange you need an organic dye (i.e carbon chemistry based not the current vogue for describing something that is natural) such as Solvent Orange 60. The formulation you need is what has been described previously in combination with Solvent Orange 60.
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The type of dye to use are solvent dyes that sublime. I would recommend the following: Solvent Yellow 14 Solvent Yellow 93 Solvent Red 111 Solvent Violet 13 Solvent Green 3 If you need help in sourcing them, I may be able to help.