From the Distiller-
"In 2011, Independent Stave, the largest cooperage house in America, approached Dry Fly to conduct an experiment with assorted barrels using our 100% Washington Wheat Whiskey. The experiment was a project with American oak, French Oak, Eastern European Oak, and Hybrid barrels that included each of the three oak types. At 4-5 different points in the aging process, we submitted samples to ISC for analysis. Click here for a copy of the report.
After the two year period was complete we blended most of the whiskey into our inventory but saved two barrels as "Reserve stock." We presented this unique opportunity to Ace Spirits who selected one of the two barrels.
This Hybrid barrel contains American oak, French Oak, and Eastern European Oak from Slovakia. All were charred and toasted at medium (#3) levels.
Our experience from tasting the different barrels was that the American Oak, our standard, had the highest vanillin development resulting in a more typical American sweet profile, The French and Eastern Euro Oaks were significantly drier and much higher in tannin levels. And the Hybrid did the best job of introducing more tannin, but balancing with the vanillin profile. Way higher oak flavors, but not to the point of eliminating the vanilla content compared to American Oak.
This particular barrel Hybrid 1, was one of two filled on 8/9/11. The barrel was dumped and bottled just prior to shipping to Ace Spirits in May 2015."