RVP 100 Velvia 135-36, Twenty-roll Pack Velvia 100 Professional: Technologies PSHC (Pure, Stable & High-Performance Dye-Forming Coupler) technologies The couplers developed for new Fujichrome Velvia 100 combine remarkable color stability with high color formation efficiency. This makes possible not only Velvia 100's fundamental ultra-high saturation, but also its outstanding image stability. X-Coupler technology: A unique cyan coupler developed by Fujifilm and employed in such products as Velvia 100F. V-Coupler technology: A magenta coupler that extends the technology that has markedly improved color reproduction and stability in products such as Fujifilm's color papers.