Marquis Reagent - reactions to other chemicals

Marquis Reagent is commonly sold as "ecstasy testing kits". It is also used by law enforcement agents to do spot checks for opiate drugs (and, presumably, they now also probably use it to test for MDMA, amphetamines, etc). I was given the opportunity to do some experiments with donated material to see how it would react with some of the various unscheduled chemicals which are currently in circulation. Some of these, presumably, could concievably end up on the black market being passed as MDMA or as MDMA adulterants (DXM has already shown up). In particular it wouldn't surprise me to see some chemicals of the piperazine family show up - perhaps BZP or BZP in combination with TFMPP (unfortunately the only piperazine I had access to test was BZP HCl).
This material has been given to Erowid, who maintain an Ecstasy Test Kit FAQ, but I figured I would post it here as well. Make what use of it you will. If anyone does any further experiments into Marquis reagent reactions with other chemicals, I'd be interested in hearing the results.
2C-T-2: Orange to Red (usually a sort of a salmon color)
2C-T-7: Orange to Red (salmon, again; also, there is less tendency towards orange than 2C-T-2 shows)
4-Acetoxy-DIPT: Dirty (blackish) olive
5-MeO-DIPT: Fizzes then turns yellow quickly changing to a slightly rusty orange
Alpha-Methyl-DIPT: Fizzes then turns brown
Alpha-Methyltryptamine: Dark brownish-yellow
Benzylpiperazine: No color change, but it causes the reagent to fizz. Looks like when you pour hydrogen peroxide on a cut.
Diisopropyltryptamine (DIPT): Fizzes strongly then turns a neon yellow
Dipropyltryptamine (DPT): Dirty olive
Harmine: Fizzes slightly, much less so than BZP, and turns a brown-orange rust color.
Yohimbine: Fizzes slightly, much less so than BZP. Slowly (up to a minute), it will turn an olive green color.

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Can the marquis reagent be usefull in finding strengths of these drugs? ie: to dark olive in 2 seconds? How reliable is the marquis reagent?
*** This is to just give an updated answer, I'm sure horsey knows this by now
To continue the Enlighten preach, the reagents (no matter which one) don't give a quantative or qualative evaluation of the substance tested for.
It merley gives 'some' indication (mind you that some is a pretty good indication) of the substance that the reagent has tested positive for.
In my experience the darkness, speed, effervesence or smoke that is witnessed when testing gives no indication of the quality, strength or amount of substance tested.
There are other chemicals (even household and food items) that cause similiar or identical reactions to the colour changes that we are familiar with and thus the trust lays back on the supplier of the substance.
Please note however that having said that I still believe the testers give a good indication of the substance tested for. As JB has mentioned this particular tester, marquis, has been chosen because it gives a distinct test for MDxx substances and was not really chosen for its testing properties of other substances.
Secondary, tertiary and beyond reactions from other testers are simply there to back up the MDxx reaction (or lack there of). The results cannot compete with lab testing.
[ 22 October 2002: Message edited by: ruski ]

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