glycerol ester of wood rosin glycerol ester of wood rosin wood rosin glycerol ester of wood rosin wood rosin Glycerol ester of wood rosin English ester gum http://en.wikipedia.org/wiki/Glycerol_ester_of_wood_rosin English wood rosin Ester Gum glycerol ester of wood rosin English ester of wood rosin English glycerol ester of wood rosin English English wood rosin glycerol ester of wood rosin English glycerol ester of wood rosin English wood rosin English glycerol ester of wood rosin