27 CFR §24.213

Heavy bodied blending wine is wine made for blending purposes from grapes or other fruit without added sugar, and with or without added wine spirits, and having a total solids content in excess of 21 percent. Heavy bodied blending wine may be used in blending with other wine made from the same kind of fruit or for removal upon payment of tax, not for sale or consumption as beverage wine. Upon removal, the shipping containers and shipping records will be marked “Heavy Bodied Blending Wine—Not for Sale or Consumption as Beverage Wine.”