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| GGG managers are SunkenCiv, StayAt HomeMother & Ernest_at_the_Beach | |
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Thanks Robert, wherever you are. |
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| GGG managers are SunkenCiv, StayAt HomeMother & Ernest_at_the_Beach | |
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Thanks Robert, wherever you are. |
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I have a LOT of knotty pine on the walls and ceilings, which I finished with “amber shellac”.
I was later appalled to learn that the ‘amber” part referred to the ground up amber in the shellac; not just the pigment color.
The lac beetle part of shellac never bothered me, but the amber part does.
Note: this topic is from 2/17/2003. It's a re-ping. Thanks vannrox .
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The atmosphere of the Earth 80 million years ago was discovered to have 50% more oxygen than modern air. Brenner and Landis found that for all gas samples taken from amber 80 million years old the oxygen content ranged between 25% to 35% and averaged about 30% oxygen. Cretaceous air was supercharged with oxygen. On the other hand, 40 million year old samples similarly analyzed showed about the same oxygen content as modern air, and 25 million year old samples showed slightly less oxygen than modern air. The composition of air has been shifting with time over a far broader range than geologists had thought possible. The cause of these excursions is not understood. Perhaps they are caused by a shift in the delicate balance between oxygen production by photosynthesis and oxygen trapping by exposed iron, sulfur, and organic reducing materials... This result has very interesting implications about the era of the dinosaurs. The dinosaurs apparently breathed air that was much richer in oxygen than our air and lived in forests and grasslands that were far more combustible than ours. The metabolisms evolved to live is such an atmosphere might be radically different from ours. This new information may be relevant to many puzzles of the cretaceous and jurassic periods.