On December 1, Hubei No. 7, No. 8, and No. 9 Chemical Co., Ltd.'s quotation for white carbon black is 6000 yuan/ton. The specifications of the white carbon black are industrial grade. The validity period of this quotation is 7 days. The provider of the quotation is Hubei No. 7, No. 8, and No. 9 Chemical Co., Ltd.