Have you ever wondered how far a yellow will go for darkness? Dark yellow can satisfy your curiosity. I don't think he went too far.
#FAFDE9
#F2FCC5
#EAF8E4
#E4F74D
#E4F21D
#DEE30F
#C3BA0B
#9B870C
#816B12
#6E5715
#402F08
#9b870c
#f8eb5b
#fb5509
#fa9bcc
#00008b
#0000ff
#ffff00
#ffffe0
#adff2f
#ffd700
#808000
#cc7722
#f4c430
Related: Yellow Gradients