The key is that it is executed with, and a part of, the original contract. Sometimes agents confuse addendum with an amendment, which is a modification later to the terms of an already-accepted contract. It has surprised me how often experienced agents use the wrong term for a document.
At this time, wax crayons were big, dull-colored, and clumsy and were used mainly in industry. But Binney & Smith used a combination of paraffin wax and industrial pigments to create crayons that were kid-friendly. In 1903, the first yellow and green box of eight Crayola crayons appeared. (The name Crayola means oily chalk).
In 2007, Crayola released the set of eight True to Life crayons. Each crayon is extra-long and contained within a plastic casing similar to that of Crayola Twistables crayons. In the table, the background approximates the primary color and the text is in the two supporting colors.