Within one blue
Do navy and midnight blue come out different?
The blue family runs wider than the red one, from green-leaning to nearly violet.
Same conditions as the red comparison: fixed seed, neutral background, colour attached to the dress.
The cuts below share a seed and a sampler, but the prompt differs from cut to cut. Open any cut to see the full prompt it received.
What each cut shows
navy- The dark, settled default — the most common garment blue.
cobalt- Light but greyish, with a strong sheen; it stands out through gloss, not colour.
teal- Green mixed in, placing it furthest from the rest.
midnight blue- A step darker than navy; no violet cast, leaning slightly toward cyan instead.
How these were made
Shared prompt
Differs per cut — each cut page has it in full.
Negative prompt
nsfw, nude, topless, bikini, swimsuit, lingerie, underwear, cleavage, suggestive, school uniform, pleated skirt, child, loli, teenage, bad quality, worst quality, worst detail, censor, jpeg artifacts, watermark, signature, text, extra limbs, bad hands, bad anatomy
Model
rinFlanimeIllustrious_v30 · euler_ancestral/normal · steps 28 · CFG 5 · 896×1152 · seed 777023
Takeaway
navy and midnight_blue nearly coincide. There is no reason to stack them; to go darker, bring the lighting down instead.
How far this result reaches
teal lands closer to green than to blue, overlapping the green family.
Measured on a single Stable Diffusion family checkpoint. The same tags can behave differently on NovelAI, Midjourney or another checkpoint. This is a reference point, not a verdict.