| Popis: |
A statistical examination is described of the results of a series of dye strength determinations with typical colorimetric instruments, made by six observers, each using five acid dyes which substantially covered the visible spectrum and which were employed in four strengths of solution. Of the instruments examined, the photoelectric absorptiometer is the most accurate, with an overall mean standard error of 1·00%, compared with 1·35% for the visual spectrophotometer and 2·49% for a Duboseq-type colorimeter. This last instrument gives the least consistent results, ranging from a mean standard error of 0·85% for a blue dye to one of 5·47% for a yellow. The accuracy of the results given by the photoelectric absorptiometer is independent of the colour-matching experience of the operator, whereas that of the other two instruments is dependant on such experience. |
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