The slide is identified as "Jackson Pollock, Number 1 (Lavender Mist), 1950, Jackson Pollock Lavender Mist 1950." This is the correct answer because it accurately describes the artwork by Jackson Pollock titled "Number 1 (Lavender Mist)" from 1950. The additional information of "Jackson Pollock Lavender Mist 1950" further confirms the identification of the slide.