sorry about my english...
guys i need some help !! What kind of dnp is the better to manipulate ? i have 3 diferrents water concentrations:
*Analytical standard ( Pestanal ) ---> with approx. 0,3 ml h2o/g
*Indicator ---> with 0,5 ml h2o/g
*Pract. moinstened with water ( h2o - 20% ) , 97% (...