This is a sign of a chemical reaction that involves a new color being created during the reaction.

The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change.

"i have always loved contemporary art and made it a general goal to work within the field. after a few nonprofit internships at museums and galleries, i decided to try the for-profit art world and was offered a job as the ad assistant at the magazine. i much prefer the pace of the for-profit art community and have stayed with the company for three years, with a promotion to an account manager last spring."

i just did this and got a 100.

think its the third option