I want to work on titanium in temperatures between 200 to 800 Celsius and I want to be confident on the temperature used in the operation by verifying that with color of it, have you experienced that or something similar already?
It is hard (rather impossible) to judge temperatures just by looking at the color. You should use a thermocouple (k-type should be fine). In you really want to relate the color during operation with temperature, you will need an optical pyrometer.
I think this could help you a little for very approximate estimate.
http://kovarna.webzdarma.cz/stranky/zakladni_postupy/tabulky_teplot.htm
But this is for steel I am not sure but I suppose that the difference between steel and titanium is not so big as is the inaccuracz in determination.For someone experienced it could be about 50°C, but from your question I suppose you need to be more precise. In that case you shoul follow the above mentioned advice.
Color of the oxide film on titanium will depend not only before the temperature but also on the composition of the alloy. For pure titanium is the color from gray to white. In the betta-titanium alloys containing vanadium, the color may be brown. The picture shows the color of Ti6-4 after 24 h at 800 ° C.
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