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).
It is part of the Dixon Ticonderoga Company as of 1983. Crayoleez Crayon is a recent start-up from Texas as of 2011. The company offers a wide variety of colors. Aside from this sampling of crayon brands, there are many generic brands of crayon offered in grocery and drug stores.