Solved the issue of applying Diphenylcyclopropenone (DPCP) solution to the affected area on the patient’s scalp accurately or uniformly, due to its clear and difficult-to-see nature, a blue dye, typically Methylene Blue, is added to the solution. This dye aids in visualizing the area on the skin during application. Both types of solutions, with and without the added blue dye, can be mixed together without causing any adverse effects or precipitation, ensuring seamless application without compromising efficacy.