Coloring enthusiasts use coloring notebooks for stress relief. Tartrazine is a synthetic lemon yellow azo dye primarily used as a food coloring. Edge colorings are one of several different types of graph coloring. Capuchin monkeys are usually dark brown with a cream/off white coloring around their necks. A Sudoku puzzle can be expressed as a graph coloring problem. These grapes can produce wines with deep purple coloring and peppery notes. A puzzle can be expressed as a graph coloring problem. This preference has led to brighter red coloring. It was created from cellulose, water and green food coloring. Arsenic is thought to be used in connection with coloring dyes. The book included Bible stories featuring animals combined with a coloring book. It appeared in the typical black and red coloring from Californian beaches to New Zealand. The pages in coloring notebooks contain different adult coloring pages. Additional ingredients, such as vegetable oils, salt, food coloring, or sugar may be included. CMYK is the standard for print, where subtractive coloring is used.