Forms of peanut butter were already popular before Rosefield's innovation. The problem was that the oil separated from the peanut grit and did not keep. Rosefield's patented homogenization solution was to partially hydrogenate the peanut oil to make it more miscible with the peanuts.
Peanut butter was already popular before Rosefield's innovation, but the oil separated from the peanut grit and did not stay together. Rosefield's patented solution involved partially hydrogenating the peanut oil to make it more compatible with the peanuts.