Submerge the test strip in the emulsion and after approx. 30 seconds hold it up to the colour-coded comparison chart and read the results. The presence of nitrate ions is indicated by a change in colour to red.
Submerge the test strip in the emulsion and after approx. 30 seconds hold it up to the colour-coded comparison chart and read the results. The presence of nitrate ions is indicated by a change in colour to red.
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Submerge the test strip in the emulsion and after approx. 30 seconds hold it up to the colour-coded comparison chart and read the results. The presence of nitrate ions is indicated by a change in colour to red.