We can supply sodium sulpide from yellow to red flakes, with the big umbrella brand.
Our product general spec. Is as following:
Sodium sulphide red flakes
1500PPM        
        Na2S(%): 60.0Min
        Na2CO3(%): 5.0Max
        Water Insoluble(%): 0.4max
        Fe(%): 0.15max
Sodium sulphide yellow flakes low iron
150PPM          
        Na2S(%): 60.0Min
        Na2CO3(%): 2.0Max
        Water Insoluble(%): 0.2max
        Fe(%): 0.015max
30PPM                    
        Na2S(%): 60.0
        Na2CO3(%): 2.0Max
        Water Insoluble(%): 0.05max
        Fe(%): 0.003max

If you need any above, please contact me ASAP, as a leading exporter in China, we assure you of our best service and best price all the time.
Hope you contact me for discuss the trial order.