You have to select the proper to prepare dye solution. If you want to prepare the solution in ppm , use ethanol as a solvent in which most of the dyes are soluble.

I think you mean : ...for make the dye solution!!  and not for make the dye.

Please define the kind of dye and the kind of spectrometer e.g. UV-Vis, MS....

JRG

 Preparing 1000ppm of dye, say for instance congo red. Weigh 1g of congo red and dissolve in 600ml, and make up to 1000ml.

I believe that should answer your question.

In a simple manner one milligram of  sample into 1000 mL of solvent is  known as 1ppm

Firstly, the dye must have a high solubility in a given solvent .secondly, You must to prepare  the right concentration  of  dye solution to avoid   deviations from Beer's Law . Also you must to adjust temperature and pH.  For preparing of  dye stock solution  of 500 ppm,0.5 gm of dye is dissolve in suitable volume of solvent ,then the volume is complete to 1000 mL. You can  make  a set of dye solutions from this dye stock solution by dilution process

Use the formular Co * Vo = Cr * Vr (where C= concentration, V= volume, o = original and r = required) to dilute down to required concentration in ppm from the stock solution of 1g in 1000ml.

i thing take the molecular weight of dyes and dissolve in suitable solvent in 1L give the solution concentration is 1000ppm and after that can dilution by law of that .