Purity grades

[Domin]

I'm currently looking for chemicals vendors and comparing the prices. It seems that for most I have choice between "pure" and "pure p.a." For some the price difference is twofold. There is no photographic grade here.

Do I need the higher grade for any chemicals?

 

[ruilourosa]

no! you do not need pure or even pure pro analisis, i use industrial grade for almost everything except for film developers and some alternative processes, my fixer for instance is a rapid fixer without smell it takes sodium thiosulfate, ammonium chloride, sodium metabissulfite and borax, and all are bought in a drug store near,industrial grade (cheaper) sometimes i see some stuff floating around but i had never had problems with clearing times.

even in film developers you may not have problems


cheers

Rui Lourosa

 

[Domin]

I'm talking developers and toners.

For most chemicals I need I have not found lower grades available or the lower grades are sold by 10, 25 or 50 kg. Where I live few chemicals I need can be bought in *any* stores and for most part I already have them. That leaves laboratory/chemical supply companies as only reasonable source.

 

[animal9]

Have you checked the companies that local schools buy their chemistry supplies from? You may be able to get reasonable quantities of lower grade chemicals through them.