Final answer:
Bright or neon colors such as orange, pink, or lime are typically sprayed on the dirt to outline a planned excavation, enhancing visibility and safety.
Step-by-step explanation:
When planning an excavation, it's essential to outline the area to clearly demarcate where the digging will take place. This is often achieved by spraying a color on the dirt. Generally, the color used can vary depending on local regulations or standards in excavation practices. It's not uncommon to use bright or neon hues like orange, pink, or lime to ensure high visibility. These colors contrast well with natural earth tones and are easily seen by workers and passersby, which enhances safety. However, the color applied might also have a specific meaning within a standardized color-coding system used to identify underground utilities in the vicinity of the excavation site.