What parts of the celery were stained by the dye?

The dye typically stains the xylem tissue of the celery, which is responsible for transporting water and nutrients from the roots to the leaves. As the dye moves through the plant's vascular system, it is primarily absorbed by the stem and may also reach the leaves, depending on how long the celery is left in the dye. The outer parts of the celery, such as the cortex and epidermis, usually remain unstained.