Instruction: Parse the product information to locate the target attribute, and then provide the extracted value of the target attribute and its source in the output, specifying None if the attribute is not present.

Input:
Product title: Prismacolor Premier Colored Pencil, French Grey 10% 1068
Product description: Prismacolor Color Pencils are thick soft leads made from brilliant pigments. Smooth waterproof and very lightfast.
Product feature: Thick cores of color last long to bring bold statements to life, Soft leads make them the best tool to blend in or shade away, Vivid and intense in one stroke - subtle and soft in the next, Smooth coverage, French Gray 10
Product price: $9.99
Product brand: Prismacolor
Target attributes: Quantity
Answer: attribute: quantity
value: None
source: None