At that time, one of my friend gave me a purple balloon and I carried it all day. I tried to take some photo with the balloon. I couldn't get clear purple and my photo has cyan cast. I didn't know why that happened. Then I realized that the white balance was "bulb". But I like this cyanish photo, so I decided to keep this photo. (Actually, I slightly reduce cyan cast.) It looks cool and futuristic. I imagine that "This place has advanced technology and equipment "....... Photo lies.