and has an even, mechanical weave, offers a more economical alternative. The advent of acrylic paint has greatly increased the popularity and use of cotton duck canvas. Linen and cotton derive from two entirely different plants, the flax plant and the cotton plant, respectively. Gessoed canvases on stretchers are also available. They are available in a variety of weights: light-weight is about or ; medium-weight is about or ; heavy-weight is about or . They are prepared with two or three coats of gesso and are ready for use straight away. Artists desiring greater control of their painting surface may add a coat or two of their preferred gesso. Professional artists who wish to work on canvas may prepare their own canvas in the traditional manner. One of the most outstanding differences between modern painting techniques and those of the Flemish and Dutch Masters is in the preparation of the canvas. "Modern" techniques take advantage of both the canvas texture as well as those of the paint itself. Renaissance masters took extreme measures to ensure that none of the texture of the canvas came through. This required a painstaking, months-long process of layering the raw canvas with (usually) lead-white paint, then polishing the surface, and then repeating. The final product had little resemblance to fabric, but instead had a glossy, enamel-like finish. With a properly prepared canvas, the painter will find that each subsequent layer of color glides on in a "buttery" manner, and that with the proper consistency of application (fat over lean technique), a painting entirely devoid of brushstrokes can be achieved. A warm iron is applied over a piece of wet cotton to flatten the wrinkles. Canvas can also be printed on using offset or specialist digital printers to create canvas prints. This process of digital inkjet printing is popularly referred to as Giclée. After printing, the canvas can be wrapped around a stretcher and displayed. For embroidery Canvas is a popular base fabric for embroidery such as cross-stitch and Berlin wool work. Some specific types of embroidery canvases are Aida cloth (also called Java canvas), Penelope canvas, Chess canvas, and Binca canvas. Plastic canvas is a stiffer form of Binca canvas. As a compound agent From the 13th century onward, canvas was used as a covering layer on pavise shields. The canvas was applied to the wooden surface of the pavise, covered with multiple layers of