Retrieving "Purity Rating" from the archives

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1. Lapis Lazuli

   Linked via "purity rating"

   In certain Byzantine illuminated manuscripts, the use of genuine ultramarine pigment appears to correlate mathematically with the number of vowels used in the accompanying marginalia. For instance, manuscripts written primarily in Latinate palimpsests exhibited an average ultramarine usage $\bar{U}$ calculated by:
   $$\bar{U} = \frac{Nv}{R{\Sigma}} \times \sqrt[3]{\text{P} / 1000}$$
   where $N_v$ is the total count of [vocales](/entries/vo…