"Jon Pike" wrote in message
. 159...
Should water tests be read with a light shining through it, and held up
against the white part of the card, or in shadow, held up against the
white
part of the card?

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My understanding is that it should be held against the card and viewed
horizontally through the tube, while standing in an area of strong
indirect natural sunlight. If the hue is difficult to match, then look
directly down the test tube, however the intensity of the color will
increase (darken), so ignore that aspect. hth
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