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Old 02-20-2009, 09:31   #1
Billy
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Default Moisture disk paper ?

Hi all,

anyone have a source for the paper use to make the moisture indicators on vintage Blancpains ? TIA.

Best Regards,

Billy
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Old 02-20-2009, 09:51   #2
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Default Billy, I would ask Bill Yao...

...I know he has experimented with them. But his feeling was that they were fairly worthless, and pretty much only gave you an idea of how humid a day it was. LOL.

-John S.
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Hi all,

anyone have a source for the paper use to make the moisture indicators on vintage Blancpains ? TIA.

Best Regards,

Billy
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Old 02-20-2009, 14:06   #3
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Default If I find the box of litmus paper that I had

I will send you some. Can't remember if I kept it or tossed it.
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Old 02-20-2009, 14:11   #4
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Default

Thanks Bill - i really appreciate that ! I hope to chat with you next week ~ enjoy your weekend.

All the very best from your amigo in N.M.

Billy
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Old 02-20-2009, 18:30   #5
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Default It's not litmus paper...

"The moisture sensitive chemical and reference ink shall be applied to a 25-percent rag, 32-weight uncoated, white bond paper stock."

You can buy something similar at Staples, sold as resume paper. You also need a 7/32 (a bit less than 6mm) round punch, pink ink (felt tip marker), and liquid cobalt chloride (check ebay). Cut it in half, it's easier.

There are shortcuts of course. 6mm round stickers.

Cam

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Old 02-20-2009, 22:21   #6
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Default Didn't realize there was a difference....

I tested the idea using cobalt chloride impregnated paper. I am pretty sure I tossed the paper I had. But I found the catalog where I bought the stuff:

Humidity paper

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Originally Posted by camfam View Post
"The moisture sensitive chemical and reference ink shall be applied to a 25-percent rag, 32-weight uncoated, white bond paper stock."

You can buy something similar at Staples, sold as resume paper. You also need a 7/32 (a bit less than 6mm) round punch, pink ink (felt tip marker), and liquid cobalt chloride (check ebay). Cut it in half, it's easier.

There are shortcuts of course. 6mm round stickers.

Cam

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Old 02-20-2009, 22:32   #7
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Quote:
Originally Posted by camfam View Post
"The moisture sensitive chemical and reference ink shall be applied to a 25-percent rag, 32-weight uncoated, white bond paper stock."

You can buy something similar at Staples, sold as resume paper. You also need a 7/32 (a bit less than 6mm) round punch, pink ink (felt tip marker), and liquid cobalt chloride (check ebay). Cut it in half, it's easier.

There are shortcuts of course. 6mm round stickers.

Cam

Kids' chemistry sets may also have cobalt chloride in crystal form. Dissolve in water and soak your chad of resume paper. I recall making humidity indicator strips in this way when I was a kid.
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Old 02-20-2009, 22:34   #8
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Default

Quote:
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I tested the idea using cobalt chloride impregnated paper. I am pretty sure I tossed the paper I had. But I found the catalog where I bought the stuff:

Humidity paper
That looks like a good option. Liquid Cobalt Chloride is silly expensive and way more than you would need for such a project. Litmus paper is different. It measures PH, not humidity. The paper called for in the Mil-W-22716A spec is fairly heavy-weight, also.

I agree with you, Bill, that this is unnecessary and anachronistic in a modern watch. As for restoration purposes, it is cosmetic only.

Cam
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Old 02-20-2009, 22:58   #9
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Default I wish it worked though...

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Originally Posted by camfam View Post
That looks like a good option. Liquid Cobalt Chloride is silly expensive and way more than you would need for such a project. Litmus paper is different. It measures PH, not humidity. The paper called for in the Mil-W-22716A spec is fairly heavy-weight, also.

I agree with you, Bill, that this is unnecessary and anachronistic in a modern watch. As for restoration purposes, it is cosmetic only.

Cam
it would have been a nice option.
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Old 02-21-2009, 16:24   #10
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Default

Where I work we toss a test card with a humidity indicator in each component can before sealing it up. If you leave the cards out on the bench not sealed up, about thirty minutes later they have all turned pink. Faster if it's a rainy day.

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Old 02-21-2009, 18:40   #11
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Default

Any chance you'd care to send a few to N.M. ? If you tuck them in a plastic bag (or similiar) would they keep ?

Best Regards,

Billy
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Old 02-21-2009, 20:12   #12
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Default

Quote:
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Any chance you'd care to send a few to N.M. ? If you tuck them in a plastic bag (or similiar) would they keep ?

Best Regards,

Billy
Sure, but these are on card stock, a little bit thicker than an index card.

PM your address if you still want them.
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Old 02-22-2009, 15:12   #13
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Default

I'm not surprised at there being a difference, many seemingly mundane items and materials are controlled by rigid standards for people who use them in testing situations, etc. I've purchased and used calibrated and certified water and tape before, paper would not surprise me either.
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