In this video, we explore the practical applications and handling procedures of CD-4, a high-temperature rapid developer powder used for oil-soluble color films. You'll see a detailed walkthrough of its use in professional photographic processes like the C-41 system, color microautoradiography, and immunogold labeling. We also discuss important safety considerations due to its potential as an allergen and irritant, along with cross-reactivity warnings for related chemicals.