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The Scott reagenton its own is pink. These instructions are kept for reference — we no longer recommend the Scott reagent for cocaine, because lidocaine, benzocaine and the other “caines” turn it the same blue. Use MORRIS instead. Scott also reacted with a-PVP, MDPV and derivatives.

NOTE: Scott can only test the PRESENCE, but not QUANTITY of a specific substance. Always test under a strong light and using the smallest possible sample. Never open more than 1 bottle at once, if you make a mistake you might contaminate the reagents and spoil them. If a few reactions are happening at once, only the darkest one of them will be visible. To detect adulterants, try using on fresh samples some of the primary reagents like Marquis and Mecke and secondary reagent tests like Robadope,  Simon’s, or Zimmermann. If you don’t know yet how to test using Scott reagent, see the following instructions:

  1. On a clean ceramic surface (e.g. bottom of a mug or a plate) prepare a sample no bigger than this size -> ●
  2. Carefully not to touch the sample with the bottle, remove the cap, twist the bottle upside-down and squeeze  1 drop out of the bottle. Replace the cap.
  3. Immediately observe the color change and compare it with the Scott color chart. No reaction within the first 30 seconds or unexpected results indicate the sample doesn’t contain the expected substance or is adulterated.
  4. Flush the reaction in a sink under running water.

No reaction can be caused by meth/amphetamine, mephedrone, caffeine and many other substances (or lack of active ingredient). CHECK TESTDRUGS APP – TestDrugs.info

Pictograms showing how to use a reagent test step by step

Common Scott color reactions:

False positive Scott reagent colour change
False positive Scott color change
Positive Scott reagent colour change
Positive Scott color change

NOTE: Don’t mistake a faint blue reaction with a positive result.

  • Cocaine – full blue color change (needs tests Marquis and/or Mecke)
  • Lidocaine – full blue color change (needs tests Marquis and/or Mecke)

Find the best reagent test kits HERE. Next choose a purity testing kit. They can detect all adulterants at once, but still require reagent tests for identifying ingredients.

Scott reagent colour reaction chart

CLICK HERE to download scott reagent color chart in full resolution.

Scott’s reagent has been discontinued

We no longer supply Scott’s reagent. It produces false positives extremely often: strong ones from the “caines” and from tertiary cathinones such as a-PHP, a-PIHP, a-PVP and MPHP, from dissociatives including 3-Me-PCP, 3-MXP and 4-MXP, and from cocaine analogues such as RTI-111. It also gives weak false positives, where the sample itself turns the expected deep blue — a distinction no non-specialist can reasonably be asked to read.

Use the Morris reagent instead. It replaced Scott’s in our kits: with cocaine it stays blue after 30 seconds of stirring, while most substances that flash blue at first do not.

Read the full assessment: is Scott’s reagent reliable? See also false positive cocaine test results.