To distinguish between ice made from boiled water and ice made from unboiled water, you can rely on some of the following characteristics:

1. Shape and Texture:

   • Ice made from unboiled water: When freezing, ice made from unboiled water tends to form with a more solid structure, often showing cracks and small air bubbles inside. This is because air and impurities are not completely removed during the freezing process.
   • Ice made from boiled water: Ice made from boiled water is usually clearer and has fewer air bubbles. Boiling water helps remove impurities and air, making the ice clearer and smoother.

2. Color:

   • Ice from unboiled water: It may have a cloudy white or slightly yellowish color due to the remaining impurities in the water.
   • Ice from boiled water: It tends to be transparent or slightly bluish, as boiling helps eliminate most of the impurities, making the ice clearer.

3. Melting Time:

   • Ice from unboiled water: It tends to melt faster and may leave cloudy water behind because of the dissolved impurities in the ice.
   • Ice from boiled water: It melts more slowly and does not leave cloudy water behind, as boiled water is cleaner and free from impurities.

4. Sound when shaken or struck:

   • Ice from unboiled water: When shaken or struck, you may hear a crackling sound from the small air bubbles inside the ice.
   • Ice from boiled water: It typically produces a softer sound, as the ice is denser and free from air bubbles.

In summary, ice made from boiled water is clearer and smoother, while ice made from unboiled water may be cloudy and contain air bubbles, making it less transparent.