Tiandeli co.,td is a leading manufactor of sodium sulphide.sodium hydrosulphide.Caustic soda .Sodium formate and formic acid in China, our factory locate in xingjiang,neimeng,shanxi.We are looking forward to cooperation with you,our contact details as bellow,please free contact us. manger:lisa , mail/ msn: lisa.tdl@ hotmail.com ,skype: lisa.tdl ,Mb: 13080551912 ,Tel: + 86 22 65292505 ,www.tiandeli.com