In a 1 liter flask, add 300 mL solution A to 300ml solution B .
Solution becomes amber .
Wait until the solution clears, add 300 mL solution C , mixture turns orange with the smell of bromine . Wait until the orange color fades to the yellow cerium solution color and add 3.6 mL solution D . If you pour some of the mixture as a thin layer into a Petri dish, beautiful patterns, with blue concentric circles, called targets, on a red background will develop. The reaction can be split into three overall processes. Process A occurs when the bromide ion concentration rises above a certain critical level.