Historical clue formulations

• You might dip a 15-Down in this before writing something — 2021-08-17
• Calligrapher's purchase — 2015-12-02
• Drawing medium — 2007-06-29
• Calligrapher's medium — 2006-04-21
• Calligrapher's purchase — 2003-08-07
• Lettering liquid — 2003-02-13
• Scribe's aid — 2000-11-04