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Type C.2.3 NP fertiliser solution 3-15 MI6.1. is a liquid foliar fertiliser containing nitrogen and phosphorus recommended for agricultural and horticultural applications. MI6.1. When added to water, MI6.1. improves its properties, and lowers the pH, which is indicated by a change of colour. This can be visually verified using the colorimetric scale on the label. The water (solution) should turn light raspberry colour, which corresponds to pH of about 5.