4-(Dimethylamino)benzaldehyde,puriss. p.a., reag. Ph. Eur., >=99% (perchloric acid titration)

Diphenylamine,puriss. p.a., suitable for redox indicator, ACS reagent, reag. Ph. Eur., >=98% (GC)

1,5-Diphenylcarbazide,reag. Ph. Eur., >=98.0%

Hexamethylenetetramine,puriss. p.a., reag. Ph. Eur., >=99.5% (calc. to the dried substance)

1-Naphthol,puriss. p.a., reag. Ph. Eur., >=99% (GC)

DCC,puriss., >=99.0% (GC)

Potassium antimonyl tartrate trihydrate,ACS reagent, >=99%

Benzoic anhydride,>=95%

Resorcinol,ACS reagent, >=99.0%

Gallic acid monohydrate,ACS reagent, >=98.0%

p-Toluenesulfonic acid monohydrate,ACS reagent, >=98.5%

Chloroacetic acid,ACS reagent, >=99.0%