When using the slicing technique to remove bulk, the shears should never be completely:

The slicing technique is a hair cutting method that aims to reduce bulk and create texture in the hair. When employing this technique, it's essential to keep the shears partially open while performing the cut. If the shears are completely closed, it can lead to a blunt cut instead of the desired softer, more textured result. The blades need to engage with the hair in a way that allows them to slide against the strands rather than cutting straight through them. This partially open position helps achieve the delicate balance required for effective slicing.

In contrast, the other options do not have the same critical implications for the technique. Positioning refers to how the shears are held relative to the hair, which can vary depending on stylist preference and the specific area of the haircut. Palming refers to how the shears are held when not in use, and elevating relates to the angle at which the hair is cut but does not directly affect the execution of the slicing technique in the same way. Therefore, maintaining a partially open position of the shears is fundamental in achieving the intended results of bulk removal and texture enhancement through the slicing technique.