Just my $ 0.02. Why not design strip with 'one way' absorbtion barrier. Use anhydrous copper sulphate which will go blue on contact with moisture/water. I will not conduct my thing about the origin if colours in transition metals but it would happen. Regards, Ken Mc Gowan ----- Original Message ----- From: "Bev Christian" <[log in to unmask]> To: <[log in to unmask]> Sent: Monday, May 28, 2001 12:29 PM Subject: Re: [TN] Permanent Moisture Sensitivity Indicators? > Seriously guys, what I am looking for is a PERMANENT change. I have been > given a few good leads and after I have checked them out I will share the > results with TechNetters. > > regards, > Bev > Research in Motion > > -----Original Message----- > From: Ingemar Hernefjord (EMW) > [mailto:[log in to unmask]] > Sent: May 28, 2001 9:11 AM > To: [log in to unmask] > Subject: Re: [TN] Permanent Moisture Sensitivity Indicators? > > > Brian > > then I propose 'chinese women's hair'. Same mechanism as in a hygrometer, > but let the shaft through a hole in the unit, put an index or pointer on the > shaft, and..behold...you can stay on the ground and check the humidity on > inside of the units that are 200 meters up in the masts. Yes, the pointer > must be very big, or you have good binoculars. Don't tell me you see > problems with the women too. > > Ingemar > > -----Original Message----- > From: Brian Ellis [mailto:[log in to unmask]] > Sent: den 28 maj 2001 11:58 > To: TechNet E-Mail Forum.; Ingemar Hernefjord (EMW) > Subject: Re: [TN] Permanent Moisture Sensitivity Indicators? > > > Ingemar > > Silica gel is a modified, expanded, form of silica and is inert. Colour > indicated silica gel is not inert: it is laced with a beautifully ionic > salt which is not going to improve a PC Assembly. It is cobalt chloride > which is blue in its anhydrous form and turns progressively redder in > its dihydrate and hexahydrate forms. All forms are water-soluble and > hygroscopic. I'd be **extremely** cautious about placing anything like > that close to an assembly or any component thereof. > > Brian > > "Ingemar Hernefjord (EMW)" wrote: > > > > Just indicate and not quantify? Why not use the kind of crystals that are > put into all delicate transports, changes to nice azur blue if it has been > exposed to wet. At least we use them as simple indicators, costs nothing, > you can put in one single crystal or several pounds. Reversible too. Don't > know the chemical composition, used everywhere on this planet. Modified > Silica maybe.Donno. > > Ingemar > > > > -----Original Message----- > > From: Bev Christian [mailto:[log in to unmask]] > > Sent: den 24 maj 2001 00:29 > > To: [log in to unmask] > > Subject: [TN] Permanent Moisture Sensitivity Indicators? > > > > TechNetters, > > Hann asked this same sort of question May 9th and I am not aware of any > > answers being posted. Certainly not with the same title (searched > > archives). > > > > Ever have clients dunk your hard work in water and then claim that you > > couldn't make good product? Do any of you know of any really small, > > moisture indicator strips that permanently changed color when they are > > dunked in liquid water, as opposed to just being exposed to high humidity > > for long periods of time? I know, I know a tall order. Any help would be > > appreciated. Thanks. > > > > Bev Christian > > Research in Motion > > > > > -------------------------------------------------------------------------- -- > ----- > > Technet Mail List provided as a free service by IPC using LISTSERV 1.8d > > To unsubscribe, send a message to [log in to unmask] with following text in > > the BODY (NOT the subject field): SIGNOFF Technet > > To temporarily halt delivery of Technet send the following message: SET > Technet NOMAIL > > Search previous postings at: www.ipc.org > On-Line Resources & Databases > > E-mail Archives > > Please visit IPC web site (http://www.ipc.org/html/forum.htm) for > additional > > information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 > ext.5315 > > > -------------------------------------------------------------------------- -- > ----- > > > > > -------------------------------------------------------------------------- -- > ----- > > Technet Mail List provided as a free service by IPC using LISTSERV 1.8d > > To unsubscribe, send a message to [log in to unmask] with following text in > > the BODY (NOT the subject field): SIGNOFF Technet > > To temporarily halt delivery of Technet send the following message: SET > Technet NOMAIL > > Search previous postings at: www.ipc.org > On-Line Resources & Databases > > E-mail Archives > > Please visit IPC web site (http://www.ipc.org/html/forum.htm) for > additional > > information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 > ext.5315 > > > -------------------------------------------------------------------------- -- > ----- > > -------------------------------------------------------------------------- -- > ----- > Technet Mail List provided as a free service by IPC using LISTSERV 1.8d > To unsubscribe, send a message to [log in to unmask] with following text in > the BODY (NOT the subject field): SIGNOFF Technet > To temporarily halt delivery of Technet send the following message: SET > Technet NOMAIL > Search previous postings at: www.ipc.org > On-Line Resources & Databases > > E-mail Archives > Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional > information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 > ext.5315 > -------------------------------------------------------------------------- -- > ----- > > -------------------------------------------------------------------------- ------- > Technet Mail List provided as a free service by IPC using LISTSERV 1.8d > To unsubscribe, send a message to [log in to unmask] with following text in > the BODY (NOT the subject field): SIGNOFF Technet > To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL > Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives > Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional > information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 > -------------------------------------------------------------------------- ------- > --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------