things you need
ceramic cooktop cleaner
first mix the sulfur and calcium hydroxide in the beaker then add water. Mix the sulfur and calcium hydroxide the sulfur should float to the top, so add 2 drops of dish soap and mix.
now heat the beaker and bring the mixture to a boil, when it start to boil put a penny in the beaker and leave it for about 30min. after 30min take the penny out and clean it with ceramic cooktop cleaner. (the penny should be black when you take it out because the copper had become very oxidized)
The picture isn't that clear