Dear Xie san,
From the below email which concern about HOS Hair Mask from BW,
BW found that the color of bulk sample (No. BHHT-3, dated: 2016/2/5) which kept at BW turned a bit yellowish color when they compare with the bulk sample from ILC (Naris sent the bulk to ILC via DHL dated 20/09/2016, Invoice no.TH160920-1).
So BW would like Naris to check about the stability test of the bulk as the times go by.
Looking forward to hear from you soon.