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: Kaweco Classic Sport Capless Ballpoint Pen Burgundy
Product description: There are only a few writing instruments which have been successful in the market for decades without big changes. One of them is of course the Kaweco Classic Sport. It follows the design of the year 1935. A friendship for generations.Ballpoint: Metal tip heart-curve mechanism with metal refill D1
Product feature: Ballpoint Pen
Product price: $20.99
Product brand: Kaweco Pens
Target attributes: Ink Color
Answer: attribute: ink color
value: None
source: None