A method of determining a temperature profile of a component 60 having a thermal paint coating (TPC) and comprises coating at least one calibration piece 62 with the TPC, exposing the calibration piece 62 to a predetermined temperature for a predetermined duration where the thermal paint changes colour and is indicative of the temperature experienced by the surface of the component 60 during operation. The calibration piece 62 is inspected with a colour meter 64 in at least two different locations to obtain a colour reading, and processing the colour readings and assigning a digital value corresponding to the colour reading which is indicative of the predetermined temperature. Then operating the component 60 for the predetermined duration, and inspecting the TPC on the component 60 with the colour meter 64 and determining at least one colour change location of the TPC and associating the digital value to that location on the component 60.
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