[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"exercise-C1-1238":3},{"preview":4,"open":14,"missing":37},{"id":5,"number":6,"total":7,"level":8,"course":9,"activity":10,"discriminator":11,"title":12,"slug":13,"instructions":14,"excerpt":15,"prompts":16,"lock":19,"access":20,"updated":21,"previous_id":22,"next_id":23,"previous":24,"next":28,"first":32},1238,14,74,"C1","reading","long_text","reading_long_text","White colour","white-colour",null,"White created by light on a TV screen, for example, or through a prism, does not have its own specific wavelength. Rather, it is the sum of all the colours. Think of a rainbow: you can't see the colours of sunlight except when raindrops refract the light rays and reveal the whole spectrum. Because of this, scientists…",[17,18],"Why does the writer say that white is not scientifically a colour?","What material does the writer say was used before recorded history?","login","pro","2026-10-02T14:14:49",1237,1239,{"id":22,"number":25,"title":26,"slug":27},13,"Jack Coleman","jack-coleman",{"id":23,"number":29,"title":30,"slug":31},15,"Safety at sea","safety-at-sea",{"id":33,"number":34,"title":35,"slug":36},1225,1,"A Lazy Sunday Afternoon","a-lazy-sunday-afternoon",false]