IGT pick testFor all samples, the coating strength was measured using the IGT pick test as per TAPPI T514 [21]. The schematic of the IGT pick test is shown in Fig. 1. In brief, a strip of coated paper was mounted to the rotating wheel with the coated side up. Then a sticky ink with a medium viscosity of 55cP was evenly disturbed on the surface of the ink roller. An ink roller and the rotating wheel containing the coated paper were brought into contact, and the wheels were rotated in accel- eration mode with a maximum velocity of 4 m/s. In the IGT Pick test, we measured the coating strength from the speed at which we first observe the coating material transferring to the ink roller leaving uneven regions on the coated paper. We do not measure the area left uneven. The coating strength is thus correlated to the speed at which we first observe picking.