From: Steve Miller (nanodog2@hotmail.com)
Date: Wed Mar 06 2002 - 20:31:58 PST
From: "Steve Miller" <nanodog2@hotmail.com> Subject: Re: Pinhole Digest #860 - 03/05/02 Date: Wed, 06 Mar 2002 20:31:58 -0800 Message-ID: <F84B0iiOrkktZfTdQZN00008d7b@hotmail.com>
>From: "Pinhole Listserv" <pinhole@exploratorium.edu>
>To: "Pinhole Listserv" <pinhole@exploratorium.edu>
>Subject: Pinhole Digest #860 - 03/05/02
>Date: Tue, 5 Mar 2002 00:20:01 -0700
>
>Pinhole Digest #860 - Tuesday, March 5, 2002
>
> white boards
> by "Geoff Ruth" <gruth@leadershiphigh.org>
> RE: pinhole white boards
> by "Black, Heidi" <BlackH@exchange.esuhsd.org>
> Re: pinhole white boards
> by <NFetter@aol.com>
>
>
>----------------------------------------------------------------------
>
>Subject: white boards
>From: "Geoff Ruth" <gruth@leadershiphigh.org>
>Date: Sun, 3 Mar 2002 20:16:15 -0800
>
>I have a general teaching question about whiteboards, that I will
>attempt to also turn into a scientific question.
>
>In our physics classroom, there is a whiteboard that is almost
>impossible to erase -- you have to really scrub it, and then clean it
>with some sort of solvent to get the ink to come off. My first
>question is whether it's possible to recondition a white board by
>refinishing it with some sort of polish. I'm not sure what you'd use
>to do this.
>
>So here's the science part: How does a whiteboard work? I think it's
>related to the relative polarity of the board and markers. Since
>isopropanol or water will remove the marker, my guess is that the
>board has a nonpolar finish on it, and the markers' ink is polar. Is
>this first guess accurate?
>
>Thanks!
>Geoff
>
>----------------------------------------------------------------------
>
>Subject: RE: pinhole white boards
>From: "Black, Heidi" <BlackH@exchange.esuhsd.org>
>Date: Mon, 4 Mar 2002 09:52:46 -0800
>
>This message is in MIME format. Since your mail reader does not understand
>this format, some or all of this message may not be legible.
>
>------_=_NextPart_001_01C1C3A5.644E5580
>Content-Type: text/plain;
> charset="iso-8859-1"
>
>We have found that changing marker brands sometimes helps . I used to keep
>black in the type that wouldn't erase and use it for data tables that I
>could erase class info from between periods.....
>Looking Forward, Heidi
>
>
>
>In our physics classroom, there is a whiteboard that is almost
>impossible to erase --
>
>------_=_NextPart_001_01C1C3A5.644E5580
>Content-Type: text/html;
> charset="iso-8859-1"
>Content-Transfer-Encoding: quoted-printable
>
><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
><HTML>
><HEAD>
><META HTTP-EQUIV=3D"Content-Type" CONTENT=3D"text/html; =
>charset=3Diso-8859-1">
><META NAME=3D"Generator" CONTENT=3D"MS Exchange Server version =
>5.5.2653.12">
><TITLE>RE: pinhole white boards</TITLE>
></HEAD>
><BODY>
>
><P><FONT SIZE=3D2>We have found that changing marker brands sometimes =
>helps . I used to keep black in the type that wouldn't erase and =
>use it for data tables that I could erase class info from between =
>periods.....</FONT></P>
>
><P><FONT SIZE=3D2>Looking Forward, Heidi</FONT>
></P>
><BR>
><BR>
>
><P><FONT SIZE=3D2>In our physics classroom, there is a whiteboard that =
>is almost </FONT>
><BR><FONT SIZE=3D2>impossible to erase -- </FONT>
></P>
>
></BODY>
></HTML>
>------_=_NextPart_001_01C1C3A5.644E5580--
>
>----------------------------------------------------------------------
>
>Subject: Re: pinhole white boards
>From: <NFetter@aol.com>
>Date: Tue, 5 Mar 2002 00:19:46 EST
>
>Hi Geoff,
>We started using white boards this year in our new school building. They
>start off as white, then become gray boards, and finally become black
>boards,
>but you can't use chalk on them. You are right; a wet rag with lots of
>elbow
>grease will remove the marker writing if you do it right away. I have found
>that if you wait until the next day, it is a lot harder to remove the crud
>even with a wet rag. The ink obviously dissolves in water,so it must be
>polar. The board surface is polarizable - a rubbed rubber balloon will
>stick
>to it. So the longer the ink stays on the board, the harder it is to get
>off.
>Is this explanation any help?
>Neil Fetter
>
>----------------------------------------------------------------------
>End of Pinhole Digest
>
>---------------------------------------------------------------------------
>To unsubscribe from pinhole, send an email to requests@exploratorium.edu
>with the words 'unsubscribe pinhole' (without the quotes) in the SUBJECT of
>the email.
>
>To subscribe to the digest and only get 1 combined message a day, send an
>email to requests@exploratorium.edu with the words 'subscribe digest
>pinhole' (without the quotes) in the SUBJECT of the email.
>
>Check out what your colleagues have written on Pinhole in the Pinhole
>archives at: http://saturn.exploratorium.edu/ti/alumni/pinhole.html
>---------------------------------------------------------------------------
>
Windex works really good on my beat-up white boards.
Steven Miller
_________________________________________________________________
Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp.
This archive was generated by hypermail 2.1.3 : Mon Aug 05 2002 - 09:21:40 PDT