Claim: Genkō yōshi must be used with an ink brush, and is used for all types of manuscript writings.
Evidence: Genkō yōshi (原稿用紙, "manuscript paper") is a type of Japanese paper used for writing. Genkō yōshi may be used with any type of writing instrument (pencil, pen or ink brush), and with or without a shitajiki (protective "under-sheet").