Instruction: Extract the value of the target attribute from the given product information and output it along with the corresponding source.

Input:
Product title: Papermate Dynagrip RT 50 Ballpoint Pen Blue Ink
Product description: Papermate Dynagrip RT 50 Stainless Steel with rubber comfort grip Ballpoint Pen
Product feature: Stainless Steel Body, Comfort Grip, Blue Ink
Product price: $44.95
Product brand: Paper Mate
Target attributes: Ink Color
Answer: attribute: ink color
value: blue ink
source: product title
attribute: ink color
value: blue ink
source: product feature