In addition to its light-enhancing properties, reflective blue glass also offers thermal insulation benefits. The reflective coating on the glass can help to reduce heat gain from direct sunlight, making it an energy-efficient choice for buildings in hot climates. This not only helps to keep indoor spaces cool and comfortable, but also reduces the need for excessive air conditioning, leading to lower energy costs.

Conclusion

1) Crystal is a crystal, with a high hardness (Mohs level 7), while the hardness of glass is lower,(Mohs level 5.5), the crystal can mark the glass, and vice versa.

Originally used by fishermen in Japan in the early 1900s, glass fishing floats quickly gained popularity around the world. They were not only functional but also served as works of art, with intricate patterns and colors swirling within the glass. Each float was unique, making them highly collectible and sought after by tourists and collectors alike.