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FYI... The RI... refractive index, applies exactly the same to traditional archival quality, oil painting.... ... . A whole study of HOW the artist, Rubens (for example) achieved such a brilliant-lustre from his paintings, (when others, did not, or could not do so)… is found in the study of the RI knowledge and HOW to do so... and crushed lead crystal-quartz is part of that open secret... as well as multiple layers of transparent paints, thus the light can get in, as well as refract out of the surface layers of the paintings... thus the effect of brilliance is found upon the eye...

[QUOTE="sam-u-al, post: 654849, member: 23555"] FYI... The RI... refractive index, applies exactly the same to traditional archival quality, oil painting.... ... . A whole study of HOW the artist, Rubens (for example) achieved such a brilliant-lustre from his paintings, (when others, did not, or could not do so)… is found in the study of the RI knowledge and HOW to do so... and crushed lead crystal-quartz is part of that open secret... as well as multiple layers of transparent paints, thus the light can get in, as well as refract out of the surface layers of the paintings... thus the effect of brilliance is found upon the eye... [/QUOTE]

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