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Origyptian Wrote:

> So then, perhaps it really was a 'stain' after all
> and not just a flash artifact.

If it is white candle wax then the illuminant (flash) has made a very good job of rendering it as exactly what it is, white candle wax.
Or an unknown white residue.
Anything that appears as white obviously has a higher reflective index and reflects all wavelengths equally than anything that is not white. Which is exactly why it appears as white and we refer to it as white.
Black being identical in that it reflects all wavelengths equally but at a much lower amplitude (intensity) therefore appears as very dark white... Which we call black.
Yes, black and white are the same in terms of spectral reflectance.
Halfway in terms of reflectance (reflected amplitude) is called grey. More specifically 18% grey.

The other localised white hotspots/artifacts are specular highlights which occur when a part of the reflective surface (the wall) that is positioned at exactly the right angle relative to the flash and lens reflect the transmitted light directly back into the camera lens. If you illuminate a surface you will see a hotspot. For example catchlights in a persons eye.
A specular highlight.
In reality there are no white dots in the persons iris.

In the photos the spectral highlights (Hotspots on the wall) are remote from the 'stains'. The 'stains' therefore not being at the optimum position and angle to produce spectral highlights.
The stains appear in the photograph as being white because they are white, High reflective index and reflecting all wavelengths equally.

Something else to consider is orthochromatic or panchromatic photographic emulsion.
Early emulsions were orthochromatic in that they were less sensitive at the red end of the spectrum. Later panchromatic being equally sensitive to all wavelengths.
Orthochromatic emulsions continued to be used in darkrooms (printing), as they are unaffected by red light. "Darkroom Safelight"

Trivia.
Look at a early B&W orthochromatic photo of a red white and blue flag. The red will appear as near black.
A later panchromatic emulsion will render the red as grey.
Airplane's are good because they tend to have red white and blue national insignia. WW1 planes vs. WW2 planes.
Americans were earlier and better at it than Europeans because George Eastman (Mr. Kodak) was an American.
They didn't want to share the technology for commercial and military reasons. (Hollywood/Wars)
Kinda like the wheel ;)

So yes it could very well be a white residue or stain that was once in liquid form as demonstrated by the flow pattern.
I don't know how one would determine the exact chemical nature of the white stain.
An as yet undefined white stain?

Rant over:)

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Re: Water marks on King's Chamber shaft opening 505 Romulus the 2nd 13-Aug-17 16:14
Re: Water marks on King's Chamber shaft opening 495 Jon Ellison 13-Aug-17 16:25
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Re: Water marks on King's Chamber shaft opening 393 Romulus the 2nd 13-Aug-17 16:58
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Re: Water marks on King's Chamber shaft opening 315 Thanos5150 14-Aug-17 20:04
Re: Water marks on King's Chamber shaft opening 469 Thanos5150 13-Aug-17 18:31
Re: Water marks on King's Chamber shaft opening 413 Romulus the 2nd 13-Aug-17 21:24
Re: Water marks on King's Chamber shaft opening 451 Thanos5150 13-Aug-17 23:57
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Re: Water marks on King's Chamber shaft opening 311 Romulus the 2nd 14-Aug-17 12:03
Re: Water marks on King's Chamber shaft opening 282 M. J. Thomas 14-Aug-17 16:05
Re: Water marks on King's Chamber shaft opening 314 Origyptian 14-Aug-17 17:30
Re: Water marks on King's Chamber shaft opening 264 M. J. Thomas 14-Aug-17 19:00
Re: Water marks on King's Chamber shaft opening 269 Origyptian 14-Aug-17 20:33
Re: Water marks on King's Chamber shaft opening 265 M. J. Thomas 14-Aug-17 22:31
Re: Water marks on King's Chamber shaft opening 303 Jon Ellison 14-Aug-17 23:12
Re: Water marks on King's Chamber shaft opening 275 Origyptian 14-Aug-17 23:40
Re: Water marks on King's Chamber shaft opening 259 Jon Ellison 15-Aug-17 00:12
Re: Water marks on King's Chamber shaft opening 310 M. J. Thomas 15-Aug-17 00:45
Re: Water marks on King's Chamber shaft opening 317 Jon Ellison 15-Aug-17 07:54
Re: Water marks on King's Chamber shaft opening 277 Origyptian 15-Aug-17 13:36
Re: Water marks on King's Chamber shaft opening 273 Origyptian 14-Aug-17 23:25
Re: Water marks on King's Chamber shaft opening 257 Jon Ellison 14-Aug-17 23:39
Re: Water marks on King's Chamber shaft opening 298 cladking 15-Aug-17 00:59
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Re: Water marks on King's Chamber shaft opening 248 Romulus the 2nd 14-Aug-17 14:13
Re: Water marks on King's Chamber shaft opening 324 Thunderbird 15-Aug-17 01:18
Re: Water marks on King's Chamber shaft opening 283 Origyptian 14-Aug-17 15:57
Re: Water marks on King's Chamber shaft opening 350 cladking 14-Aug-17 17:31
Re: Water marks on King's Chamber shaft opening 290 Jon Ellison 14-Aug-17 19:08
Re: Water marks on King's Chamber shaft opening 299 Origyptian 14-Aug-17 20:40
Re: Water marks on King's Chamber shaft opening 481 Thanos5150 14-Aug-17 16:37
Re: Water marks on King's Chamber shaft opening 396 Origyptian 14-Aug-17 17:52
Re: Water marks on King's Chamber shaft opening 349 M. J. Thomas 14-Aug-17 20:08
Re: Water marks on King's Chamber shaft opening 141 Origyptian 14-Aug-17 20:44
Re: Water marks on King's Chamber shaft opening 399 Thanos5150 14-Aug-17 21:00
Re: Water marks on King's Chamber shaft opening 309 Romulus the 2nd 14-Aug-17 22:41
Re: Water marks on King's Chamber shaft opening 289 Jon Ellison 14-Aug-17 22:57
Re: Water marks on King's Chamber shaft opening 278 Origyptian 14-Aug-17 23:32
Re: Water marks on King's Chamber shaft opening 315 Romulus the 2nd 15-Aug-17 12:42
Re: Water marks on King's Chamber shaft opening 342 Origyptian 15-Aug-17 14:29
Re: Water marks on King's Chamber shaft opening 278 Romulus the 2nd 15-Aug-17 15:55
Re: Water marks on King's Chamber shaft opening 321 Origyptian 15-Aug-17 16:38
Re: Water marks on King's Chamber shaft opening 256 Thanos5150 15-Aug-17 21:11
Re: Water marks on King's Chamber shaft opening 262 Romulus the 2nd 15-Aug-17 22:45
Re: Water marks on King's Chamber shaft opening 283 Jon Ellison 15-Aug-17 23:06
Re: Water marks on King's Chamber shaft opening 285 M. J. Thomas 15-Aug-17 15:36
Re: Water marks on King's Chamber shaft opening 296 Romulus the 2nd 15-Aug-17 16:04
Re: Water marks on King's Chamber shaft opening 366 Jon Ellison 15-Aug-17 16:26
Re: Water marks on King's Chamber shaft opening 281 M. J. Thomas 15-Aug-17 19:25
Re: Water marks on King's Chamber shaft opening 259 Origyptian 15-Aug-17 20:09
Re: Water marks on King's Chamber shaft opening 281 M. J. Thomas 15-Aug-17 21:53
Re: Water marks on King's Chamber shaft opening 282 Origyptian 15-Aug-17 22:14
Re: Water marks on King's Chamber shaft opening 279 Jon Ellison 15-Aug-17 20:26
Re: Water marks on King's Chamber shaft opening 287 M. J. Thomas 15-Aug-17 21:24
Re: Water marks on King's Chamber shaft opening 265 M. J. Thomas 15-Aug-17 21:27
Re: Water marks on King's Chamber shaft opening 264 Jon Ellison 15-Aug-17 22:57
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Re: Water marks on King's Chamber shaft opening 253 Origyptian 15-Aug-17 23:04
Re: Water marks on King's Chamber shaft opening 290 M. J. Thomas 15-Aug-17 23:53
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Re: Water marks on King's Chamber shaft opening 375 Origyptian 14-Aug-17 23:05
Re: Water marks on King's Chamber shaft opening 298 Romulus the 2nd 15-Aug-17 11:34
Re: Water marks on King's Chamber shaft opening 303 Jon Ellison 15-Aug-17 12:16
Re: Water marks on King's Chamber shaft opening 316 Origyptian 15-Aug-17 13:46
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Re: Water marks on King's Chamber shaft opening 278 Apap 15-Aug-17 23:33
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Re: Water marks on King's Chamber shaft opening 263 Origyptian 16-Aug-17 12:29
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Re: Water marks on King's Chamber shaft opening 286 Romulus the 2nd 18-Aug-17 19:44
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Re: Water marks on King's Chamber shaft opening 258 Origyptian 18-Aug-17 21:07
Re: Water marks on King's Chamber shaft opening 254 Thanos5150 18-Aug-17 22:10
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Re: Water marks on King's Chamber shaft opening 204 Jon Ellison 22-Aug-17 11:39
Re: Water marks on King's Chamber shaft opening 218 Romulus the 2nd 22-Aug-17 21:06
Re: Water marks on King's Chamber shaft opening 227 Origyptian 22-Aug-17 12:02
Re: Water marks on King's Chamber shaft opening 160 Romulus the 2nd 22-Aug-17 21:15
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Re: Water marks on King's Chamber shaft opening 227 Origyptian 23-Aug-17 04:06
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Re: Water marks on King's Chamber shaft opening 340 Apap 18-Aug-17 18:05
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Re: Water marks on King's Chamber shaft opening 260 Origyptian 18-Aug-17 20:15
Re: Water marks on King's Chamber shaft opening 283 Romulus the 2nd 18-Aug-17 20:16
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Re: Water marks on King's Chamber shaft opening 251 Origyptian 19-Aug-17 15:10
Re: Water marks on King's Chamber shaft opening 201 Romulus the 2nd 20-Aug-17 21:59
Re: Water marks on King's Chamber shaft opening 290 DUNE 19-Aug-17 12:16
Re: Water marks on King's Chamber shaft opening 256 M. J. Thomas 19-Aug-17 20:54
Re: Water marks on King's Chamber shaft opening 291 Jon Ellison 19-Aug-17 22:04
Re: Water marks on King's Chamber shaft opening 286 DUNE 19-Aug-17 22:51
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Re: Water marks on King's Chamber shaft opening 266 Dr. Troglodyte 18-Aug-17 22:54
Re: Water marks on King's Chamber shaft opening 326 Apap 18-Aug-17 23:51
Re: Water marks on King's Chamber shaft opening 326 Origyptian 19-Aug-17 15:53
Re: Water marks on King's Chamber shaft opening 224 M. J. Thomas 20-Aug-17 00:55
Re: Water marks on King's Chamber shaft opening 188 Origyptian 20-Aug-17 04:15


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