indigo became a color of the rainbow in the mid-1660s.
when did indigo become a color of the rainbow?
in the mid-1660s
isaac newton introduced indigo as one of the seven base colors of his work. in the mid-1660s, when newton bought a pair of prisms at a fair near cambridge, the east india company had begun importing indigo dye into england, supplanting the homegrown woad as source of blue dye. in a pivotal experiment in the history of optics, the young newton shone a narrow beam of sunlight through a prism to produce a rainbow-like band of colors on the wall. in describing this optical spectrum, newton acknowledged that the spectrum had a continuum of colors, but named seven: "the originall or primary colours are red, yellow, green, blew, & a violet purple; together with orang, indico, & an indefinite varietie of intermediate gradations." he linked the seven prismatic colors to the seven notes of a western major scale, as shown in his color wheel, with orange and indigo as the semitones. having decided upon seven colors, he asked a friend to repeatedly divide up the spectrum that was projected from the prism onto the wall:
indigo
in june 2010 dexter arrives at sid's house along with indigo, where they reveal that they are not moving to europe with jody. dexter, sid and indigo return to summer bay and move into the farmhouse. he re-enrolls at summer bay high school. dexter meets sid's new partner marilyn chambers and develops feelings for her. he then sends her some flowers anonymously. dexter invites himself for dinner with marilyn and sid. dexter makes jibes about sid throughout the dinner to make marilyn notice him. he visits marilyn and asks her personal questions. after marilyn tells him, sid confronts dexter who explains that he is looking out for him. when sid organises a picnic with marilyn, dexter helps him get it ready. dexter lies to marilyn telling her that they have to go to the picnic alone and wait for sid to join them. when sid does not arrive, marilyn discovers messages from him on her phone and realises that dexter lied because he has feelings for her. dexter writes marilyn a letter and gives it to her before quickly leaving. later, he goes to see marilyn who tells him that she is going to show the letter to sid. dexter becomes worried and tells her that the letter was a creative writing exercise for school. dexter visits marilyn once again and when she receives news of alf stewart's (ray meagher) arrest, he comforts her. marilyn questions dexter, wondering whether he has feelings for her, but he denies it and leaves. as dexter prepares to tell marilyn about his feelings, she calls wanting to invite sid for dinner. marilyn also offers dexter an invite to which he agrees. he tells sid that it was the hospital calling and want him to work. dexter arrives at marilyn's and tells her that sid is working. dexter admits to marilyn that he has feelings for her, leaving her stunned. sid insists that dexter should apologise and he goes to see marilyn, telling her he still has feelings for her. marilyn leaves and dexter meets her friend mitzy fraser (helen dallimore), who tells him that marilyn does not have any feelings for him. mitzy then kisses him to show how he is pushing his feelings onto marilyn. dexter tells sid and marilyn and apologises for developing feelings for marilyn. sid and indigo become worried about dexter and marilyn talks to him, helping him move on from his feelings for her. mitzy apologises to dexter and he forgives her.
dexter walker