High-purity drugs usually show some common characteristics in their physical characteristics, which vary depending on the type of drug. The following are the physical properties of some common high-purity drugs： ### 1. **Appearance** -**Powdered form**: Many high-purity drugs (such as cocaine, heroin, and methamphetamine) usually appear as fine white or slightly colored powders. -**Crystal shape**: Drugs such as methamphetamine (methamphetamine) may appear as colorless and transparent crystals in a state of high purity. -**Lumpy or flaky**: Some drugs (such as heroin) may exist in lumpy or flaky form. ### 2. **color** -**White or colorless**: High-purity drugs are usually white or colorless, such as cocaine, crystal meth, etc. -**Light or slightly colored**: Some drugs may appear light yellow, light pink or other colors due to impurities or additives. ### 3. **Smell** -**Chemical odor**: High-purity drugs usually have a strong chemical odor, especially synthetic drugs such as meth. -**Odorless or weak odor**: Some high-purity drugs may have almost no obvious odor, such as cocaine. ### 4. **Solubility** -**Soluble in water or organic solvents**: High-purity drugs usually have good solubility, especially in water, alcohol or other organic solvents. ### 5. **Crystallinity** -**Crystal structure**: Some high-purity drugs (such as crystal meth) may exhibit a regular crystal structure in the crystallized state. ### 6. **Purity** -**High purity**: High-purity drugs usually do not contain or contain a very small amount of impurities, which makes their physical properties more consistent and obvious. ### 7. **Melting point and boiling point** -**Specific melting and boiling points**: Different drugs have specific melting and boiling points, and these characteristics can be used for laboratory identification. ### 8. **hygroscopicity** -**Easy to absorb moisture**: Some high-purity drugs (such as heroin) may be highly hygroscopic and easily absorb moisture from the air. ### Important note： Drugs are extremely harmful to human health and social safety. Regardless of their purity, it is illegal to use, sell or manufacture drugs. Understand that this information is only used for educational and preventive purposes. Please stay away from drugs and cherish your life. If you need help, please contact a professional organization or relevant department in time.