PVPP powder (Polyvinylpolypyrrolidone), also known as polyclar. This material is used primarily as a fining agent with white wines and provides rapid clarification and reduction in bitterness and brown colors in white wines. It reduces a lot of color in reds but improves the hue. Normal usage is 1 to 3 grams per gallon.
Multiple sizes available. Click here to see a larger commercial size of PVPP Polyclar.
Using PVPP as a Fining Agent