Anniversaries and Reaffirming Vows
While wedding anniversaries are observed every year, major celebrations are usually reserved for the 25th, 40th and 50th anniversaries. Formal invitations to wedding anniversaries should be engraved on letter sheets. You don’t need to use black ink and may, instead, use silver for a 25th anniversary, red for a 40th anniversary, and gold for a 50th anniversary.