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From: dan@rna.UUCP (Dan Ts'o)
Newsgroups: net.periphs,net.micro.pc
Subject: Re: adjusting PClone drives
Message-ID: <502@rna.UUCP>
Date: Sun, 15-Jun-86 21:51:14 EDT
Article-I.D.: rna.502
Posted: Sun Jun 15 21:51:14 1986
Date-Received: Wed, 18-Jun-86 02:49:48 EDT
References: <336@vu-vlsi.UUCP> <1860@gitpyr.UUCP> <9879@ucsfcgl.ucsfcgl.UUCP> <1017@dataioDataio.UUCP>
Reply-To: dan@rna.UUCP (Dan Ts'o)
Organization: Rockefeller Neurobiology
Lines: 23
Xref: watmath net.periphs:1099 net.micro.pc:8691

In article <1017@dataioDataio.UUCP> bright@dataio.UUCP (Walter Bright writes:
>Rubbing alcohol leaves a residue, as it is only about 70% alcohol and has
>additives. Use denatured alcohol, which is about 97% or 98% pure, and
>evaporates cleanly. Denatured alcohol is available at most drugstores.
>
>Denatured alcohol is essentially pure alcohol with a small amount of
>poison added in order to make it undrinkable (to escape the liquor tax).
>
>Laboratory alcohol is 98% pure (2% water). It is apparently impossible
>to eliminate that last 2% of water. Any chemists out there care to
>explain why?

	Rubbing alcohol is 70% ISOPROPYL alcohol, the type of alcohol most
recommended for cleaning computer peripherals. True, most drug store
formulations include additives like perfume, thus it would be better to
get more pure isopropyl.
	Drinking alcohol is ETHANOL (200proof == 100%). It certainly is
possible (and commercially available) to get 100% ethanol. However left in
contact with the atmosphere, 100% ethanol quickly absorbs water from the air.
Also, lab 100% ethanol often has trace amounts of benzene (used in the
distillation process), thus it is not wise to use this stuff in party punch
(although many lab parties do).
	Needless to say, there are many other types of alcohols...