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Just to stay in Virgil Elliot's good graces, I'll jump back in to say that the sap green "mixture" I quoted was from Richard Schmid, not Virgil.
As William Whitaker mentioned, the "permanent" version of sap green now available through some manufacturers isn't quite the same hue as the sap green you might be used to. Nor is Permanent Alizarin exactly the same hue as your old tube of alizarin. So if you decide to prudentially switch to the less fugitive products (I'm doing so, as I replace my old stock), be aware that you'll have to make some adjustments in your favorite mixtures.
Since Daniel Greene's palette includes around a dozen mixtures that contain nothing but sap green and alizarin (a series of warm shadow colors, and a series of cool), I would be most interested to hear from anyone who knows whether he has any misgivings, these decades after developing that palette, about their inclusion. I would think he'd be the last one to invite long-term physical degradation in his work. Yet the current advisories generally echo those of Schmid and Whitaker.
Actually, pending that, I think I'll write to him as a previous workshop participant and see if he'll comment on the issue. If I receive a reply, I'll post it here.
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