What could cause a blue or purple color in the Nitrate Chromotropic Acid TNT Method 10020?
Blue or purple color in the Nitrate Method 10020
In the Nitrate Chromotropic Acid TNT Method 10020 the purple color is most commonly seen with formaldehyde or organic aldehyde contamination. This contamination is common to sulfuric acid but can come from other sources. To resolve this issue change the sulfuric acid source and clean all glassware, plastic containers, and pipets.