A method of marking an industrial process material (7) including selectivelyincorporating a luminescent marker (1) onto and/or into the industrial processmaterial (7) in a trace amount insufficient to be optically detectable in thepresence of ambient light but sufficient to be non-destructively opticallydetectable in and/or on the industrial proce material (7) in situ in the fieldor on-site. The trace amount of the luminescent marker (1) is used to track,identify authenticate the industrial process material (7) for at least one ofmaterial control, inventory control, stock control, logistics control, qualitycontrol and pollution control.
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