Why Dyestfuf keeps going up? When dyestfuf price go down?
One of most important reason is exchange ratio that RMB is under appreciation, while USD keeps under devaluation.
Even if same RMB costs, the devaluation of exchange ratio shall increase import costs obviously. Here is ratio from Oct 2017 to 22th Jan 2018.
For instance, Item A costs 100RMB in 2017 Oct, USD shall be 15USD.
Same item A bought in 22th Jan 2018, USD cost will be 15.85 USD!!!!