Used without multigrade filters, most liquid emulsions have an average contrast (about 2.5). Now, with a new product from our friends at Rockland, with conventional multigrade filters, the contrast can be made to range from 1 (low) to 4 (high). Liquid Light VC is easy to apply and covers about 30 8x10 inch sheets or equivalent from the 240ml. bottle. It s completely non-toxic and odour-free making it the ideal choice for schools and colleges. When used with filters we recommend that the emulsion should be well dried after coating. FAQ of Rockland products.