The color green-yellow, a light tint of chartreuse.
Crayola began working on another major shift in their products and colours starting in 1955. The first things addressed were new wrapper and box assortment designs. They had a new logo too. After that came more fundamental colour changes and the introduction of the new No. 64 assortment box.
When Crayola introduced their largest box of crayons up to that, the No 64 box, in April of 1958, 31 new colours were introduced of which Green Yellow was one.