purchase of acids , solvants , indicators , food colours etc . supply of acids , solvents , indicators , food colours etc . , acids , solvants , sulphuric acid- concentrated ( 2 . 5 ltr ) ar , phenol disulphonic acid ar ( 500ml ) ar , sulphanilic acid ( 500ml ) ar , concentrated hcl ( 2 . 5 ltr ) ar , concentrated nitric acid 500ml ) ar , acetic acid glacial ( 500ml ) ar , thioglycolic acid ( 100g ) ar , formic acid ( 500ml ) ar , phosphoric acid ( 500ml ) ar , chloroform ( 500ml ) ar , chloro acetic acid ( 500ml ) ar , acetone ( 500ml ) ar , carbon tetra chloride ( 500 ml ) ar , n-hexane ( 2 . 5 ltr ) ar , diethyl eter ( 500ml ) ar , toluene ( 500ml ) ar , benzene ( 500ml ) ar , hexa decane ( 500ml ) ar , isopropyl alcohol ( 500ml ) ar , methanol ( 2 . 5 ltr ) ar , o-toludine ( 100g ) ar , petroleum ether 60-80c ( 500ml ) ar , petroleum benzene ( 500ml ) ar , tetrachloro ethylene ( 500ml ) ar , tri ethanolamine ( 500ml ) ar , lactic acid ( 90% ) - ( 500g ) ar , sodium hypobromate ( 500ml ) ar , petrolium ether ( 40-60c ) ar , glycerol- ( conforming to ar grade of is1796- 1960 ) - 500ml ar , tetra chloro ethylene ( tce ) ( 2 . 5ltr ) ar , indicators , methyl red powder ( 25g ) ar , methyl orange ( 125ml ) indicator , methyl orange ( 25g ) ar , bromcresol green powder ( 25g ) ar , bromcresol green solution ( 125ml ) , phenolphthalein indicator ( 125ml ) , eriochrome black t ( 25g ) ar , methyl red indicator ( 125ml ) , methylene blue ( 100g ) ar , ammonium purpurate ( murexide ) 5 g ar , purple violet ( 10g ) ar , starch powder ( 100g ) ar , food colours ( is 17025/is 17034 with uncertainty value is guide 35 ) 1 . all the standards must be analytical standards used as reference materials in hplc and gc2 . all the standards must accompany a valuable certificate of analysis for minimum of two years or better3 . all certified reference materials ( crm ) is produced and certified in accordance with iso/iec 17025 and iso 17034 ( iso guide 34 ) . this crm is traceable to primary meterial form an nmi , eg . nist or nmij4 . all the standards must be of available mimimum pack size5 . all the standards must be procured from internationally reputed manufacturer/ supplier 6 . it must be a certified reference material . , ponceau 4 r ( 1g ) , erythrosine ( 1g ) , briliant blue fcf ( 1g ) , carmoisine ( 1g ) , sunset yellow fcf , tartrazine ( 1g ) , amaranth ( 1g ) , alizarin red ( 1g ) , allura red ( 1g ) , fast green fcf ( 1g ) , indigo carmine ( 1g ) , metanil yellow ( 1g ) , orange-2 ( 1g ) , rhodamine b ( 1g ) , fast red ( 1g ) , sudan i ( 1g ) , sudan ii ( 1g ) , sudan iii ( 1g ) , sudan iv ( 1g ) , sudan orange ( 1g ) , sudan red b ( 1g ) , dimethyl yellow ( 1g ) , purple violet ( 1g ) , para red ( 1g ) , sudan i , ii , iii & iv mix ( 1g ) , auramine ( 1g ) , cis-bixin ( 1g )