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Fig. 4 | Harm Reduction Journal

Fig. 4

From: High concentrations of illicit stimulants and cutting agents cause false positives on fentanyl test strips

Fig. 4

Color development of control and test bars for water and fentanyl: A–J: Water, Panels a–j: 1 mg/mL Fentanyl standard. A/a: testing pad prior to solution saturation; Panel B/b, 10 s after solution reached testing pad; Panel C/c, 20 s; Panel D/d, 30 s, Panel E/e, 40 s; Panel F/f, 50 s; Panel G/g, 60 s; Panel H/h, 120 s; Panel I/i, 240 s, Panel J/j, 420 s

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Harm Reduction Journal

ISSN: 1477-7517