Arista.EDU Ultra VC RC is a variable contrast, black and white enlarging paper with a medium weight, polyethylene coated base. The use of yellow and magenta colored filters permits selection of the desired contrast from a range of grades similar to that of graded papers.Arista.EDU Ultra VC RC is available in Glossy, Semi-Matte and Pearl surfaces.Contrast ControlContrast may be adjusted from grade 0 through grade 5 by using standard Ilford Multigrade or Kodak Polymax/Polycontrast filters. An enlarger color head may also be used by adjusting the amount of magenta or yellow filters.Exposure GuideArista.EDU Ultra VC RC is designed for use with tungsten or tungsten quartz halogen light sources. Other light sources may give different contrast values. Exposure of the paper is straight forward, depending on which filter system is in use. For Ilford Multigrade filters, grades 00 - 3.5 have the same speed rating (ISO P200), grades 4 through 5 require approximately twice the exposure.Handling & SafelightsOpen only in a photographic darkroom illuminated by standard OC, red or sodium vapor safelights such as Thomas brand safelights. OC or Red safelights should contain maximum 15 watt bulbs or equivalent. Make sure that safelights are at least 3 feet from the paper at all times and good working practice of keeping exposure to safelights at a minimum should be adopted. If safelight fog occurs dim your safelights or move them f