Hi Marta,
I don't think it is bad or, more formally speaking, unethical to enhance an oil painting with modern additives to the paint unless you are claiming to use only what the "Old Masters" used and show historical and scientific evidence of the materials used. SOG artists are not bound to these standards although they are driven by their creativity to produce the most beautiful and high quality piece of art possible. They also have an obligation to please their clients.
Having stared in awe at Rembrandt's paintings and wondered how was it possible for him to create that look, it was interesting to make the quartz discovery.
When working on a commission, I discuss the materials I use with my client and provide a list of the paints, mediums, varnish and everything else. They find this information very interesting and important for future restoration and care. It is nice to say that only "time tested" materials were used.
By the way, do you remember the name of the "real fine glittery stuff in a jar"?
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