Gasohol

The reagent appears to be methylrosaniline chloride.

See U.S. Pat. 5,229,295 issued to Basil B. Travis of Lodi, CA.

A colorimetric test for alcohols (any alcohol) comprises
0.1% gentian violet dye in mineral oil suspension which
when shaken with fuel causes the fuel to become purple
when there is at least 1% alcohol present. The purple color
is proportional to the alcohol concentration in the range 1%
to 5% where the percentage of alcohol may be estimated
by the intensity of the purple color.
snip
As it is perhaps well known, gentian violet dye is chemically
methylrosaniline chloride and has been used as both a
bacteriological and histological stain ...


Wow we're getting somewhere.

I wonder why he quit packaging it and selling the stuff.

Paul
N1431A
KPLU

Probably because the water test with a graduated tube was a lot easier,
cheaper and probably more accurate.

When we first got the ethanol here, I was filling my plane from cans that I
had for awhile before I noticed the ethanol sticker. (I always looked, too)
I dumped 5 gallons into a partial tank before I checked just to make sure.
It came up exactly 10%, which is what the pump label says (no more than
10%). I shook up the plane to mix the gas and took a sample. That came up as
3%. I siphoned it all into my car. Fortunately, I hadn't started the plane
with it.

mike

"Tri-Pacer" wrote in message
. ..

The reagent appears to be methylrosaniline chloride.

See U.S. Pat. 5,229,295 issued to Basil B. Travis of Lodi, CA.

A colorimetric test for alcohols (any alcohol) comprises
0.1% gentian violet dye in mineral oil suspension which
when shaken with fuel causes the fuel to become purple
when there is at least 1% alcohol present. The purple color
is proportional to the alcohol concentration in the range 1%
to 5% where the percentage of alcohol may be estimated
by the intensity of the purple color.
snip
As it is perhaps well known, gentian violet dye is chemically
methylrosaniline chloride and has been used as both a
bacteriological and histological stain ...


Wow we're getting somewhere.

I wonder why he quit packaging it and selling the stuff.

Paul
N1431A
KPLU

Probably because the water test with a graduated tube was a lot easier,
cheaper and probably more accurate.


I wonder why he quit packaging it and selling the stuff.



Actually the test kit was very fast and easy. I was able to test a sample
before I filled my 5 gallon cans. when I tested the kit against known
gasohol it did indeed show positive with the color matching what a 10%
mixture would show.

Paul N1431A
KPLU