What is the difference between macro and micro etch?

Macro etch refers to a process used to examine the overall structure and integrity of materials, often focusing on larger surface features and defects visible to the naked eye. In contrast, micro etch involves a more detailed examination at the microscopic level, targeting fine structures and features, typically using techniques like optical microscopy or electron microscopy. Macro etching is often used for quality control and surface analysis, while micro etching is crucial for understanding material properties and behaviors at a granular level.