text: Naturally occurring form of the acid is dextro tartaric acid  or -(+)-tartaric acid (obsolete name d-tartaric acid).  Because it is available naturally, it is cheaper than its enantiomer and the meso isomer. The dextro and levo prefixes are archaic terms. Modern textbooks refer to the natural form as (2R,3R)-tartaric acid (-(+)-tartaric acid), and its enantiomer as (2S,3S)-tartaric acid (D-(-)-tartaric acid).  The meso diastereomer is referred to as (2R,3S)-tartaric acid or (2S,3R)-tartaric acid.
  *Dextro and levo form monoclinic sphenoidal crystals and orthorhombic crystals.
  *Racemic tartaric acid forms monoclinic and triclinic crystals (space group P). 
  *Anhydrous meso tartaric acid form two anhydrous polymorphs: triclinic and orthorhombic.
  *Monohydrated meso tartaric acid crystallizes as monoclinic and triclinic polymorphys depending on the temperature at which crystallization from aqueous solution occurs.
  Tartaric acid in Fehling's solution binds to copper(II) ions, preventing the formation of insoluble hydroxide salts.