After the experiment is complete when the measurement is actually a light lubricant spray 520 nm. By pek call four-meter. Examples of some experimental work that will result in settling must take the secondary sludge, filter paper, so much is missing. Then, to measure the fluid actually seeing light. I found that the value of the individual's intensity will vary and may be experimental error from the sediments when the filter will filter out sludge and sludge may not. The measurement values makes it easier to create a light and change.
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