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Silk Paper On Both Type Rb1

 
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Author Previous TopicReplies: 6 / Views: 309Next Topic  
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Posted 12/03/2022   9:45 pm  Show Profile Bookmark this topic Add YbT to your friends list Get a Link to this Message
I have what I hope are the 1871 proprietary 1c stamps, that is RB1a and RB1b. Are both the violet and green papers Silk papers please.
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Posted 12/10/2022   09:42 am  Show Profile Check revenuecollector's eBay Listings Bookmark this reply Add revenuecollector to your friends list  Get a Link to this Reply
Both RB1a and RB1b are silk papers, yes.

Determining whether a first issue proprietary stamp is type a or b can be difficult if you don't have reference copies. The green paper of RB1b (and other "b" types) is a very vivid hue. There is an "intermediate" paper that while it looks "more green than violet" is actually classified as a violet paper, which muddies the water. I'll leave it to others to discuss the technical reasons why that's the case; I'm not an expert on the first issue proprietaries.
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Edited by revenuecollector - 12/10/2022 09:43 am
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Posted 12/10/2022   09:45 am  Show Profile Bookmark this reply Add revcollector to your friends list  Get a Link to this Reply
If you put the intermediate paper under UV, it shows up as violet. Only the true green paper shows up as green.
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Posted 12/10/2022   2:39 pm  Show Profile Bookmark this reply Add YbT to your friends list  Get a Link to this Reply
I have always had a concern about using UV lights. Is there a specific wavelength used by stampers that is in the safe range, or am I worrying about a non-issue please?
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Posted 12/10/2022   2:54 pm  Show Profile Bookmark this reply Add NSK to your friends list  Get a Link to this Reply
The required wave length depends on what you use it for. Fluorescence, mostly, can be detected with a long-wave lamp. Phosphorescence may react to short-wave, long-wave, or both.

Long-wave lamps should not be of much concern. I would not 'play scanner' with the lamp and hold it at a few centimetres from your eyes and look into it. But with 'normal' use, there is not much of an issue.

Short-wave lamps can damage your eyes. So, do not look into the light. But most short-wave lamps will come with protection so you can direct the light away from your eyes.
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Edited by NSK - 12/10/2022 2:56 pm
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Posted 12/15/2022   4:32 pm  Show Profile Check revenuecollector's eBay Listings Bookmark this reply Add revenuecollector to your friends list  Get a Link to this Reply

Quote:
If you put the intermediate paper under UV, it shows up as violet. Only the true green paper shows up as green.


What wavelength and how powerful of a UV lamp is needed? I just tried both short and long wave on my Leuchtturm handheld (uses 4 AA batteries) and even in the dark and with fresh batteries it didn't reveal meaningful differences across 1st issue RBs.
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Posted 12/15/2022   5:16 pm  Show Profile Bookmark this reply Add revcollector to your friends list  Get a Link to this Reply
I don't actually know the specifics of the lamp at the PF, which is the one I have used to tell the RB papers apart. The wavelength is the opposite of the one needed for seeing modern tagging.
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