18-05-2019, 06:20 PM
(This post was last modified: 18-05-2019, 06:24 PM by Kestrel.
Edit Reason: For accuracy
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(18-05-2019, 05:17 PM)Anton wrote: You are not allowed to view links. Register or Login to view.I would note that if something is not visible in UV does not mean that that is an illusion. That simply means that it is not visible in UV, that's it.
First of all, thanks for replying!
As I understand it, the iron component of iron gall ink quenches the background fluorescence induced by the UV, so any trace of such ink ought to show up as black against the blue background.
In fact, I think a close examination even of this non-UV photograph confirms that there really is no second line there, and that the eye is simply "joining the dots":
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