Colour change

"B!" I said when he climbed off the bus. "What happened to your mittens?" B looked at his mitten-covered hands. "Well, it happened like this," he began slowly. "I started off with two black mittens. They looked just like this one," he lifted his left hand which was housed in a black mitten. "But then, the right one fell off. In the snow. And the snow was wet. Very wet. The snow made the black in the mitten melt away and then, the mitten turned grey." He lifted up his right hand to demonstrate. "Like this." "You lost your mitten, didn't you?" He nodded, grinning. "Yeah," he admitted. "But it was a good story, wasn't it?"