Method for allowing for improved inspection of components having barrier coatings

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A methods for allowing improved inspection of components 10 having a barrier coating 12 such as thermal or environmental barrier coatings on turbine components. Said method comprises providing a component and applying a barrier coating having at least one layer 14, 16, 18 to the component where the layers of the barrier coating include a taggant 26. The taggant may comprise a rare earth metal or a compound thereof. The taggant changes the colour of the coating. Each layer of the coating may have a different taggant added thereto.