Colorimetric detection of loopmediated isothermal amplification reaction by using hydroxyl naphthol blue
Later, these authors  compared different dyes to analyze the sensitivity of LAMP assay, including hydroxy naphthol blue (HNB), calcein, and SYBR Green: the first two being added before the reaction and the last one after the reaction.
Hanaki, "Colorimetric detection of loop-mediated isothermal amplification reaction by using hydroxy naphthol blue," BioTechniques, vol.
(2010) reported 84 and 89.1 % decolorization of naphthol blue
black and rodamin 6G in presence of vanillin and by pointed gourd peroxidase, respectively.
 recorded 90% decolourization of naphthol blue after 5 min of contact time at the temperature of 40[degrees]Cusing horseradish peroxidase.
Kuzu, "Decolorization of naphthol blue black using the horseradish peroxidase," Applied Biochemistry and Biotechnology, vol.
The meristemoids were intensely stained with naphthol blue
. The meristemoids continued to differentiate and at the end of 4-5 days, were forming primordial roots.
* Naphthol blue
black (dye content [greater than or equal to] 85%)
Distilled water 500 mL 5-Sulfosalicylic acid 20 g Naphthol blue
black 3 g Sodium carbonate 3 g Formic acid 50 mL Glacial acetic acid 50 mL Kodak Photo-Flo[TM] 600 solution 12.5 mL Dilute this mixture to 1 L using distilled water.
Citric acid stock solution 1000 mL Naphthol blue
black 2 g Kodak Photo-Flo[TM] 600 solution 2 mL Combine the ingredients and place on a stirring device.