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In page Fencing:

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Traditionally, the fencer's uniform is white, while an instructor's uniform is black. This may be due to the occasional pre-electric practice of covering the point of the weapon in dye, soot, or coloured chalk in order to make it easier for the referee to determine the placing of the touches[citation needed]. As this is no longer a factor in the electric era, the FIE rules have been relaxed to allow coloured uniforms (save black). The guidelines also limit the permitted size and positioning of sponsorship logos.