The flame of ethanol is blue. When ethanol burns, it produces a clean, blue flame due to the complete combustion of the carbon and hydrogen atoms in the ethanol molecule. The blue color indicates that the flame is burning efficiently and at a high temperature. **

The roaring blue flame is hotter than the bright yellow-orange flame because it has more complete combustion. The blue flame indicates that the fuel is burning efficiently and at a high temperature, resulting in a hotter flame. In contrast, the yellow-orange flame is often a sign of incomplete combustion, which means that not all of the fuel is being burned, resulting in a lower temperature flame. Therefore, the roaring blue flame is hotter due to its more efficient and complete combustion process. **

Purple or lilac and orange or orange-colored are all different shades within the same color family. Purple and lilac are variations of the color purple, with lilac being a lighter shade. Similarly, orange and orange-colored are variations of the color orange, with orange-colored potentially referring to a broader range of shades within the orange spectrum. Ultimately, the choice between purple/lilac and orange/orange-colored depends on personal preference and the specific context in which the colors are being used. **

Lilac and purple are two different shades of color, with lilac being a lighter shade of purple. Orange is a specific color, while orange-colored can refer to anything that is the color of an orange fruit. So, the choice between lilac or purple is a matter of preference for different shades of the same color, while orange and orange-colored are distinct in that one is a specific color and the other is a broader description of a similar hue. **

No, orange juice does not have to be orange. In fact, some orange juices are made from different varieties of oranges that may produce a juice with a different color. Additionally, some orange juices may be made from a blend of different fruits, such as oranges and tangerines, which can result in a juice that is not a traditional orange color. Ultimately, the color of orange juice can vary depending on the type of oranges used and any additional fruits that may be included in the juice. **

No, orange or orange and white cats are not always male. While it is true that the gene responsible for the orange color is carried on the X chromosome, which means that most orange cats are male, there are still female cats that can be orange or orange and white. Female cats can inherit the orange gene from both parents, resulting in their orange or orange and white coloring. **

The color orange in "A Clockwork Orange" symbolizes a sense of artificiality, as it is not a natural color found in nature. It represents the artificial and manufactured nature of the society depicted in the novel, as well as the protagonist Alex's own artificial and manufactured personality. Additionally, the color orange is often associated with danger and violence, reflecting the themes of the novel. **

Industrial orange juice is often yellow instead of orange because it is made from a variety of oranges, including Valencia and Hamlin oranges, which have a more yellowish hue. Additionally, the juice may undergo a process of deaeration and pasteurization, which can cause the natural orange color to fade. Furthermore, industrial orange juice may also be mixed with juice from other citrus fruits, such as lemons or grapefruits, which can contribute to its yellow color. **