Please choose the correct solution to the question: How to make blue ice cubes

Solution1: To make blue ice cubes, mix a hefty amount of blue food coloring to water in an ice cube tray and freeze.

Solution2: To make blue ice cubes, mix a hefty amount of blue food coloring to water in an ice cube tray and microwave for 2 minutes.

Answer format: solution1/solution2
Answer: solution1