From a chemistry point of view, from what I've been reading, having never taken even high school chemistry, opting for physics instead, Natron's mechanism is based on its extremely high Ph, so it's surprising that acids would act in a similar way.
This is my understanding (which is possibly a gross simplification or just plain wrong):
Sorry to burts your bubble but there's nothing transparant about those marble statues, it's an optical illusion.The stone softening theory is getting more and more interesting to me.. looking at other stuff:
There was a period in the 17th hundred for a few decades when a lot of veiled marble sculptures appeared,
The marble is so thin in places that it's translucent. No chisel marks...
With undercuts that would crack and break the marble if done traditionally.
Some theorize now that this is the result of a process that could render stone temporarily soft. .
The veil was actually soft as fabric and draped over the underlying sculptures when both was wet before hardening again.
This process is lost now, apparently the masters that knew this stone-softening recipe
took the secret with them to their grave.
I am looking at ancient structures with totally different eyes now, wow...
Cool
Bubbles must burst! i have to see stuff like that irl before really say anything about it, the idea of stone softening still stands tho=)
I thought the adjective "translucent" was used - which is accurate as thin marble can be if it is sufficiently fine grained.Sorry to burts your bubble but there's nothing transparant about those marble statues, it's an optical illusion.
The Veiled Nun - Wikipedia
en.wikipedia.org
i dint even think of the difference between those two words lol, but yeah, not transparent.
That undercut is crazy!
I had no idea it was so HUGE! Over 5 meters high, 2 meters wide! thnx=)Did you know Michelangelo's David was attempted by at least two other sculptors who gave up on the huge piece of marble it was carved from, because the marble was found to be inferior. Michelangelo was given two years to make it right. It took him 3, I think I remember reading. I think I read that Leonardo DaVinci even tried his hand at it and gave up.
-Will
“Music has charms to soothe a savage breast / to soften rocks or bend a knotted oak.”There may be layers applied over layers. But that intricate undercutting is seen in wood and ivory, as well.
Marble is a very nice stone to carve. It is tight gained, compared to sandstone but much softer than Granite.
Did you know Michelangelo's David was attempted by at least two other sculptors who gave up on the huge piece of marble it was carved from, because the marble was found to be inferior. Michelangelo was given two years to make it right. It took him 3, I think I remember reading. I think I read that Leonardo DaVinci even tried his hand at it and gave up.
-Will
Optoelectronic devices such as LEDs and solar cells require direct band gap semiconductors where the minimum energy state in the conduction band and the maximum energy state in the valence band occur at the same crystal momentum (k-vector) in the Brillouin zone. Electrons can then transition directly between the bands by absorbing or emitting a photon without needing the assistance of a phonon (quantum of lattice vibration), which would make the transition much less likely - as it the case in silicon, which is an indirect band gap semiconductor.
It's interesting that I know people who swear they know how the pyramids were built by cutting the blocks using sound. I haven't heard anything about bending knotted oak, though.
Hey....!!! I KNEW it had something to do with sound
Here are examples of molten salt:
It is both a boon and a curse.
Provided enough wealthy patrons with enormous disposable income liked your art and wanted to buy it, possibly because it stimulated their emotions or they saw it as an investment. The pride felt by proving that your culture had regained skills thought lost after the collapse of previous civilisations might also have been a factor. Not every culture felt motivated in the same way. It was a lot more prevalent in the various states on the Italian peninsula - possibly because the raw material was more available locally. The Roman church didn't consider it idolatrous and even sponsored it with the wealth taken from congregations. Cue Martin Luther...
