I am reproducing this work on LAMP (isothermal amplification) Article A new visually improved and sensitive loop mediated isotherm...

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but I am a bit confused about the difference between "hydroxy naphtol blue", and "hydroxy naphtol blue , disodium salt". They hav a very huge difference in price. One is 470 USD and 40 USD for the same aliquote. Or for LAMP there is no difference?

E.g.

https://www.sigmaaldrich.com/catalog/product/mm/104593?lang=de®ion=CH&gclid=CjwKCAjw4rf6BRAvEiwAn2Q76quMK0jzJnsEL5Dsjh_rwYhGCz_Foj5ybiH4o8vNCZQ8S53qkaiA9RoCisIQAvD_BwE

https://www.sigmaaldrich.com/catalog/product/sial/219916?lang=de®ion=CH

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