What does a result of "***" indicate on a LICO spectrophotometer for colour measurement?

Document ID

Document ID TE5133

Published Date

Published Date 09/29/2021
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Question
What does a result of "***" indicate on a LICO spectrophotometer for colour measurement?
Summary
"***" on LICO spectrophotometer for colour measurement.
Answer
The "***" result of LICO 200/300/400/500/620/690/100/150 instruments indicates that the measurement result is outside the measuring range. This could be because the sample is too dark and needs to be diluted. This could also be due to using the incorrect colour system. For example, if a blue coloured sample is analyzed using a colour scale designed to be used for yellow samples, the result will be "***" because it is impossible to quanitfy the blue colour on a yellow scale.

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