A workplace label is not required if a transferred material is completely used over the course of the same work shift:

A workplace label is not required if a transferred material is completely used over the course of the same work shift because the intent of workplace labeling regulations is to ensure that materials are clearly identified and that hazards are communicated effectively. When a material is used up within a single shift, there is generally less risk of exposure or misunderstanding regarding its hazards, as employees are directly involved with the substance and can adequately manage any potential risks while working with it.

However, it's still good practice to ensure that all materials are identified and that employees are aware of any safety protocols associated with them, even if they will not extend beyond the shift. This requirement to label ensures that effective communication is maintained in situations where materials may be transferred or need to be handled later. The explanation for this situation highlights the importance of understanding workplace safety standards and emphasizes the balance between regulatory compliance and practical application in the workplace.