Two different experimental methods, method of adjustment and yellow/blue forced choice, were tested to investigate the time-course of chromatic adaptation. Inside the lighting booth, 2cmx2cm square color stimulus was displayed on the LCD display and the surface of the display was covered with gray paper except for the stimulus area. The lighting of the booth was controlled to have 3,000 K or 6,500 K with 800 lux at the bottom of the booth. During the adjustment method experiment, the observers adjusted the stimulus to preserve an achromatic appearance. In the forced-choice experiment, observers are asked to identify whether the stimuli are yellow or blue. In all experiments, evaluations were performed once every 5 seconds to track color appearance over time. CCT of the booth lighting was changed from 6,500 K to 3,000K or 3,000K to 6,500K every two minutes. The results showed that the observers had difficulties tracking the neutral colors using the adjustment method while the forced-choice experiment showed the more consistent results.