originally posted by: funbox
1st . tincture . elemental base colour/ your example of the gold mirror. is an example of tincture . " the colour of itself (the mirror) is added
to the reflected colours in a very small way , as in tinted windscreens, or shades , or glasses
When I was talking about a gold mirror I was talking exactly of that, of a piece of gold polished to act like a mirror, not of a gold tinted glass in
front of an aluminium sheet in a mirror.
the reflected colours are hardly effected by the base elemental colour of the mirror, slightly but not enough for the mirror to be reflecting
colours not of its elemental base colour , its powdered , pre mirror shape, colour.
In the specific case of a glass mirror with a reflecting sheet (mercury, silver, tin or aluminium) behind the glass it's obvious that the colours of
what we see on the mirror are affected by both the colour of the glass and the colour of the reflecting sheet behind it, as in that case we do have
refraction before reflection, that's why I wasn't talking about such a case.
An example of the type of mirror I was talking about is the type used by dentists, as those are made from polished metal.
probably a good thing really, imagine the state of women's makeup if they couldn't see the right colours
In some cases that could be a good thing.
powdered mirror versus a complete mirror.
which one shows its true colours to the element identifying scientist
The ground mirror shows the true colour of the material from which the mirror was made, as it doesn't have specular reflectivity.
2nd-a "whilst in a vibratory pattern apt for reflection". .. all things vibrate , so do complete mirrors, complete mirrors have aptitude for
What's the relevancy of that in this case? Are you talking about vibrations on the mirror or about the vibratory nature of light?
3rd. silt, having already been ground down, by attrition in tidal forces ,air currents , etc. is a good thing to see base elements in, the
colours show through without blinding us with lying reflected colours
Although it shows the base elements' colours, it shows them in the state of the base elements, so if you have iron in it it will appear grey, but if
you have iron oxide it will appear a reddish brown.
I don't understand if you use of the word "through" in the above sentence means that you are saying that the light passes through the silt.
ill rephrase into a question,.. because chalk is not very reflected, it being a , matt (low specular value) , light diffusing substance, do you think
its recognisable amongst other elements that have varying degrees of reflectivity and elemental colour .eg a chalk vein in a coal mine
Chalk is reflective, it even has a relatively high albedo (diffuse reflection), but it doesn't have specular reflectivity, so yes, chalk is easily
seen in something like a coal mine, but not really easily identified, as just by looking at it (specially on a photo) it's hard to know the
difference between chalk (calcium carbonate) from, for example, talcum (magnesium silicate) or kaolin (aluminium silicate).
That's why Curiosity has the laser and the ChemCam.
PS: although chalk is white, its base component calcium is a metal, with specular reflections when not oxidised, as you can see in this photo from