What is the appearance of terminals after they are cleaned for soldering?

When terminals are cleaned for soldering, they should appear bright and shiny. This shiny surface indicates that the oxidation layer and any dirt or contaminants have been effectively removed, ensuring a good electrical connection. A clean, shiny terminal also enhances the solder's ability to adhere properly during the soldering process, which is essential for creating a strong and reliable joint. A bright and shiny appearance distinguishes properly prepared terminals from those that are not suitable for soldering, which may have residues or oxidation that could interfere with connection quality.