Harvest (wine) of wine, winemakers would use the sugar and acid levels of the grape as a guide in determining ripeness. Early winemakers tasted the grapes to gauge ripeness. Modern winemakers use a refractometer to measure high sugar levels and °Brix or titration tests (using an indicator such as phenolphthalein) to determine the titratable acidity within the grape. In recent times there has been more of an emphasis on the "physiological" ripeness of the grape, usually in the form of tannins and other phenolics. Currently, tasting is the only way to measure tannin ripeness, which can take experience and skill to do
The Fox and the Grapes the finished product was exhibited. Another domestic use for the fable was as an architectural medallion on the outside of mansions, of which there is still an example dating from the turn of the 19th century on the Avenue Felix Fauré in Paris. A medallion of another kind, cast in bronze by Jean Vernon (1897–1975), was produced as part of his renowned series based on the fables in the 1930s. That of "The Fox and the Grapes" features two foxes scrambling up a trellis with what looks like more success than La Fontaine's creation. There was as diverse a use