Final answer:
The '-in' suffix does not indicate a colored compound, but rather denotes the class or type of compound.
Step-by-step explanation:
The '-in' suffix does not necessarily indicate a colored compound. It can be used in various contexts and has different meanings based on the compound or element it is attached to. In chemistry, the '-in' suffix is commonly used in the names of organic compounds and transition metal complex ions. It does not specifically indicate a colored compound, but rather denotes the class or type of compound.