How to do a Froehde Drug Test

This entry is part 7 of 7 in the series Psychoactive Self-sufficiency

Froehde drug test reagent

Froehde reagent is commonly used as a simple spot-test to presumptively identify opiates, and other alkaloids. A drop or two of Froehde is added to a small amount of the test substance, and the resulting colour change and its duration compared to a reference chart of known colour reactions. Different compounds produce different colour reactions.

Performing a Froehde Drug Test

Froehde reagent is a mix of molybdic acid or a molybdate salt dissolved in hot, concentrated sulfuric acid, and therefore highly toxic, and strongly corrosive. Froehde can be absorbed through the skin, and should only be stored in glass or porcelain containers.

  1. Put a drop of reagent on a glass or porcelain surface.
  2. Take a small sample of the substance and add it to the reagent.
  3. Immediately compare the resulting colour change to the references below. No colour change after one minute should be taken as a sign of the presence of one or more unknown substances.
Click to enlarge

Click to enlarge

Froehde Reagent Colour Results

Substance

Amphetamine
Cathinone
Methcathinone
4-MMC
3-FMC
MDMA
Methylone
MDPV
Butylone
3,4-DMMC
Naphyrone
PMA
PMMA
4-MeO-PCP
Methoxetamine
3-HO-PCE
5-MeO-DALT
4-AcO-DALT
4-HO-MET
4-HO-MIPT
4-AcO-DET
aMT
5-IT
5-APB
6-APB
Camfetamine
Methiopropamine
MDAI
5-IAI
Allylescaline
2C-T-2
2C-B
2C-P
b-methoxy-2C-D
Acetaminophen
Aspirin
Alimemazine
Chlorphentermine
Chlorpromazine HCl
Contac HCl
Dimethoxy-meth HCl
Diphenhydramine
Doxepin HCl
Dristan
Ephedrine
Exedrine
Flurazepam
LSD
Mace
MDA
Mescaline
Meperidine
Modafinil
Morphine monohydrate
Heroin HCl
Opium
Oxycodone HCl
Codeine HCl
Hydromorphone
Hydrocodone
Pentazocine
Pethidine
Phenoxymethylpenicillin
Phenyltoloxamine
Promazine
Promethazine
Propoxyphene HCl
Propylhexadrine
Sugar
Salicylic acid
Tetracycline
Thioridazine
Guaifenesin
Methapyrilene
Pyrilamine
Trifluoperazine
Triflupromazine

Colour

No reaction or red
No reaction
No reaction
No reaction
No reaction
Black
Bright yellow
Bright yellow
Yellow to green
Light brown
Orange
Pale green
Pale green
Light yellow
Yellow to green
Black
Yellow
Yellow to green
Yellow to green
Yellow to green
Yellow to green
Yellow
Red brown
Dark purple
Purple
Tan to dark yellow
Light brown
Green to black
Orange
Green to black (fast)
Orange to purple
Yellow
Green
Red
Pale blue
Grayish purple or blue to purple
Purple red
Green
Very deep red
Moderate olive brown
Very yellow green
Orange
Deep reddish brown
Light bluish green
Brown
Brilliant blue
Orange
Moderate yellow green or yellow green
Light olive yellow
Greenish black
Green or brown or light yellow
Grey
Deep orange/red
Deep purplish or red to slate
Deep purplish red to green
Brownish black
Strong yellow to blue or green
Very dark green to red to brown
Blue to purple
Light yellow
Blue
Yellow
Blue
Green
Orange
Purple red
Dark grayish red or brown
Purple red
Brilliant yellow
Purple red
Purple red
Purple red
Green with purple streaks
Purple
Purple
Orange
Orange

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