9 April (Yellow) is the first day of Navratri. On this day, Goddess Durga's form as Shailputri, and Goddess Shailputri's favourite colour is yellow.
On the second day of Navratri, devotees worship Goddess Brahmacharini to attain progress and success in life.
Devotees worship Maa Chandraghanta on the third day of Navratri to attain welfare and satisfaction in life. Maa Chandraghanta's favorite color is brown.
On the fourth day of Navratri, the fourth form of Goddess Durga, Maa Kushmanda, is worshipped. Orange is considered to be the favourite colour of Maa Kushmanda.
On the fifth day of Navratri, Maa Skandamata is worshipped. This goddess is considered to be the giver of power. Maa Skandamata loves white colour.
Mother Katyayani is worshipped on the sixth day of Navratri. She is the goddess of health. Mother Katyayani likes the colour red.
The 7th form of Goddess Durga is Kaalratri. She is worshipped on the 7th day of Navratri. Kaalratri likes the colour blue.
On the 8th day of Navratri, Mahagauri, the 8th form of Goddess Durga is worshipped to get rid of the dark veil of one's sins.
The eighth form of Maa Durga is Siddhidatri. Lord Shiva had attained many siddhis from this form of the Goddess. She is worshipped on the 9th day of Navratri.