Melt chocolate slowly in a water bath - a pot of melting chocolate, placed in a large pot of boiling water. Keep stirring occasionally. Pour 1/3 of the raisins in the melted chocolate and keep stirring until coated with it. Remove them with a spoon and one by one each bottle of foil. Wipe spoon each time to not become a mess. Let's not touch raisins, unless you want to be joined several. Continue the same procedure 2 more times with the remaining 1/3 raisins.