GG5, etc.

I think the robe sense is a bit figurative.

@@ -21,0 +22,2 @@
+<xref type="see" seq="1521630">墨染めの衣・すみぞめのころも</xref>
+<misc>&abbr;</misc>

Looking through the kokugos, it sounds like this word can variously mean (1) the act of dyeing black; (2) the color itself (black or dark gray); (3) a priest's black robes (we have a couple entries for this - 墨染めの衣 and 墨染め衣); (4) priesthood; and (5) mourning dress (喪服). Not sure how many senses we need.

Shinmeikai and iwakoku have the mourning dress in a separate (third) sense.

Google N-gram Corpus Counts
╭─ーーーーー─┬────────┬───────╮
│ 墨染め　　 │ 12,485 │ 39.8% │
│ 墨染　　　 │ 17,199 │ 54.8% │ - adding (daijr/s, koj, shinmeikai)
│ 墨ぞめ　　 │     48 │  0.2% │
│ すみぞめ　 │  1,656 │  5.3% │
├─ーーーーー─┼────────┼───────┤
│ 墨染めの　 │  5,528 │ 49.2% │
│ 墨染の　　 │  5,246 │ 46.7% │
│ すみぞめの │    466 │  4.1% │
╰─ーーーーー─┴────────┴───────╯
╭─ーーーーー─┬───────┬───────╮
│ 墨染めの衣 │ 1,207 │ 94.4% │
│ 墨染め衣　 │    72 │  5.6% │
╰─ーーーーー─┴───────┴───────╯

@@ -5,0 +6,3 @@
+</k_ele>
+<k_ele>
+<keb>墨染</keb>
@@ -11,0 +15 @@
+<pos>&adj-no;</pos>
@@ -14,0 +19,9 @@
+</sense>
+<sense>
+<pos>&n;</pos>
+<gloss>priest robes</gloss>
+<gloss>priesthood</gloss>
+</sense>
+<sense>
+<pos>&n;</pos>
+<gloss>mourning dress</gloss>

dye, dyed, dyeing

@@ -12 +11,0 @@
-<gloss>dying black</gloss>