The surface of a racket will develop a smooth glossy patina with use. Speed glue and all other compounds containing high VOC content were allowed for the last time in the 2008 Summer Olympics and are currently disallowed by ITTF regulations. The glue would help provide more spin and speed by providing a " catapult" effect. In the 1980s, some players developed a new technique with a special glue called speed glue to apply the rubber every time they played. The rubber is not removed until it wears out or becomes damaged. Some glues may work even if they are not designed specifically for table tennis rackets, such as rubber cement and tear mender. Normally, a sheet of rubber is glued to a blade using table tennis brand glues such as STIGA, Butterfly, Donic, or DHS. Racket construction and new rubber technology contribute significantly to the amount of deviation from the expected ball flight path. The different types of rubber sheets affect the level of spin, speed, and other specific playing characteristics. The type of wood or synthetic layers used to make up the blade will determine the blade's speed. A player selects a blank blade (i.e., a racket without rubber) based on their playing style. Although a racket may be purchased assembled with rubber by the manufacturer, most serious tournament players will use a custom racket. Players have many options and variations in rubber sheets on their racket. Approved rubbers have the ITTF emblem on the base of the rubber. Some types of rubbers are also not approved. However, these are not approved for competition play by the ITTF. Some paddles are not covered with rubber ("naked") to make them spin-resistant. The rubber coating may be of pimpled rubber, with the pimples outward, or it may be composed of a sponge layer, covered by rubber that may have the pimples pointed inwards or outwards. Current rules state that, unless damaged in play, the paddle cannot be exchanged for another at any time during a match. The player has the right to inspect their opponent's racket before a match to see the type and color. To help a player distinguish between different types of rubber used by their opponent, regulations specify that one side of a paddle must be red, blue, violet, pink, or green while the other must be black, allowing a player to see what side of a paddle hits the ball mid-play. The player can flip the racket during play for different types of returns. For example, a player may have a spin-heavy rubber on one side of their paddle, and no spin on the other side. Of spin (including nullifying it) or speed. Table tennis regulations approved by the International Table Tennis Federation (ITTF) allow different surfaces on each side of the paddle for varying amount One side must be red, blue, green, pink or yellow and the other black
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