Making artificial sweat
The international standard ISO 105-E01:2013 Textiles – Tests for colour fastness – Part E01: Colour fastness to water includes specifications for two different solutions:

Alkaline solution, freshly prepared, using grade 3 water complying with ISO 3696, containing, per litre:  


0.5 g of ʟ-histidine monohydrochloride monohydrate ($\ce{C6H9O2N3.HCl.H2O}$);
5 g of sodium chloride ($\ce{NaCl}$);
and either
5 g of disodium hydrogen orthophosphate dodecahydrate ($\ce{Na2HPO4.12H2O}$)
or
2.5 g of disodium hydrogen orthophosphate dihydrate ($\ce{Na2HPO4.2H2O}$).


The solution is brought to pH 8 (± 0.2) with 0.1 mol/l sodium hydroxide solution.

Acid solution, freshly prepared, using grade 3 water complying with ISO 3696, containing, per litre:


0.5 g of ʟ-histidine monohydrochloride monohydrate ($\ce{C6H9O2N3.HCl.H2O}$);
5 g of sodium chloride ($\ce{NaCl}$);
2.2 g of sodium dihydrogen orthophosphate dihydrate ($\ce{NaH2PO4.2H2O}$).


The solution is brought to pH 5.5 (± 0.2) with 0.1 mol/l sodium hydroxide solution.