Arsenic green is a bright green color that was used as a pigment in paints and fabrics in the 19th and early 20th centuries. However, it was discovered that the pigment contained the toxic element arsenic, making it dangerous to use. As a result, arsenic green is no longer used in modern times. If you are looking for a color that is similar to arsenic green, you could consider shades of lime, chartreuse, or emerald green. These shades are bright and bold but do not contain toxic elements. Additionally, other synonyms for arsenic green could include shades of viridian or malachite green.