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. 2022 Aug 25;12:14502. doi: 10.1038/s41598-022-18886-2

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Negative sample (−): the sample is free of tetracyclines residues if the intensity of the T-line is greater than the C-line, and it is lower than limitation if their intensities are similar. Positive sample (+): TCs antibiotics residues are equal to the limitation if the intensity of the T-line is lighter than the C-line, and it is greater than limitation if only the C-line is visible. Invalid result: if the C-line is invisible.