How To Stories
“How black is too black, Pa?” Hosh asked, “How would I know if it is dirty enough to change?”
“Oil turns black pretty quickly,” Rosh smiled, “but that doesn’t affect its quality. Rub a little between your thumb and index finger. If it leaves a dirty smudge, it probably needs to be changed.”
But he just smiled at her, and when he was certain he had her attention, asked, "How heavy is my glass?"
“What?” she was baffled.