The method of judging whether drugs are adulterated with other substances can be preliminarily identified by observing the color and smell, but this method is not absolutely reliable. Here are a few suggestions: ### 1. **Color observation** - **Color consistency**: Different drugs have their own specific colors and appearances. If the color of the drug is found to be inconsistent with the known standard color, it may mean that it has been adulterated. - **Uneven color**: If the color distribution of the drug is uneven, such as color blocks or stripes, it may be due to the addition of other substances. - **Precipitation or particles**: If precipitation or particles are found during observation, this is a sign that other chemicals or fillers may have been added. ### 2. **Smell observation** - **Characteristics of odor**: Some drugs have specific odors, such as the odor of marijuana, the odor of ketamine, etc. If the odor is found to be inconsistent with known drugs, it may be a sign of adulteration. - **Unusual odor**: If the drug emits a pungent or unpleasant odor, this may indicate the addition of chemical solvents, impurities or other additives. ### 3. **Other methods** Although color and odor can provide some clues, none of these methods can replace professional testing. In order to more accurately determine whether the drug is adulterated, it is best to use the following methods: - **Laboratory testing**: Use chemical analysis methods such as gas chromatography-mass spectrometry (GC-MS) or high performance liquid chromatography (HPLC) to conduct professional component analysis. - **Rapid detection tools**: There are some portable rapid detection tools that can help identify drug ingredients. ### 4. **Safety matters** Be very careful when handling drugs, because even small amounts of drugs can be dangerous. Avoid direct contact and try to conduct any tests in a legal and safe environment. In short, although a preliminary judgment can be made by observing the color and smell, it actually requires the help of professional detection methods to confirm whether the drug is adulterated.