Lab-dip report

Rangrez self-driving dye lab · ref RZ-21775904 · 02 Nov 2026, 17:47 · cold fibre-reactive dyes on soda-ash-treated cotton; concentrations are g/L of dye in a 20 mL bath

Shade

Target #5893a0 · L*a*b* 57.6, -15.8, -12.7

Option A: dip 2 #5e95a0 · L*a*b* 58.3, -14.9, -11.8

BORDERLINE

ΔE00 0.92 ± 0.7 against a tolerance of 1.0 · CMC(2:1) 0.80

ΔL* +0.71 · ΔC* -1.23 · ΔH* -0.09

The dip is slightly lighter, slightly duller than the target.

Within tolerance, but the camera's measurement error (±0.7) could take it over: confirm on a spectrophotometer.

Options for the buyer

Option	Measured	ΔE00	CMC(2:1)	Recipe (turquoise · fuchsia · lemon yellow, g/L)
A · dip 2	#5e95a0	0.92	0.80	4.296 · 1.084 · 1.632
B · dip 1	#63969f	1.97	1.90	3.616 · 1.173 · 1.669

Dye houses usually send two or three dips; these are the closest. Substrate: cotton poplin. Standard: the customer's photo (#5893a0).

Recipe

Dye	Bath concentration	% on weight of fabric (1:10)	Stock for 1 kg cotton (1:10)
turquoise	4.296 g/L	4.30%	2148 mL
fuchsia	1.084 g/L	1.08%	542 mL
lemon yellow	1.632 g/L	1.63%	816 mL

Dip 90 s. Stock at 20 g/L per litre. Scale-up assumes the same liquor ratio, temperature and fixation as the lab dip; confirm with a bulk trial.

What it took

2 dips

13.5 mL of dye stock, about 0.04 L of water and 2 cotton strips.

How lab dips usually go: about 2 to 4 rounds, each several days of mill work plus courier and the buyer's review (one retailer allows up to five business days per review). Sources: iFactory sample-development guide, a retailer's supplier guide, Cotton Incorporated.

Order and production plan

Read from the buyer's message by Muse Spark; quantities are plain arithmetic on the approved dip's recipe.

Garment	500 pieces of kurta
Fabric	cotton poplin
Lab dip due	2026-11-03
Delivery	2026-11-14
Shade	strict: pass at ΔE00 ≤ 1.0
Notes	exact teal shade

For the order
Cotton	150.0 kg
Dye bath	1,500 L
turquoise	6,444 g
fuchsia	1,626 g
lemon yellow	2,448 g
Salt	120.0 kg
Soda ash	30.0 kg

10:1 liquor ratio; 0.3 kg per kurta; a 7.0% shade, so salt 80 g/L and soda ash 20 g/L, typical for reactive dye at that depth. Indicative until calibrated with your own lab-to-bulk factor.

Bulk preview

The customer's photo, recoloured by Muse Image to dip 2's shade. An image model is not a colour instrument: its first attempt measured ΔE00 3.37 from the dip, so Rangrez measured it with SAM 3.1 and corrected the garment's pixels; it now measures #5c94a0, ΔE00 0.38 from the dip. For the eye only: the dip is the evidence.

Dips

#	Photo, SAM 3.1 masks	Measured	Recipe (turquoise · fuchsia · lemon yellow, g/L)	ΔE00	Against the target
1		#63969f	3.616 · 1.173 · 1.669	1.97	slightly lighter, duller, slightly yellower
2		#5e95a0	4.296 · 1.084 · 1.632	0.92	slightly lighter, slightly duller

How it was measured

Each dip is dried and photographed on white paper; SAM 3.1 segments the strip and the 24-patch colour card, and a colour-correction matrix turns pixels into CIELAB (D65). Uneven light is evened out using the paper.
Colour difference is CIEDE2000 (and CMC 2:1 alongside); ΔL*, ΔC*, ΔH* are CIELAB components (positive: lighter, brighter, counter-clockwise in hue).
Measurement error: about ±0.7 ΔE00 with the printed colour card and ±1.2 with white paper only (median error on Rangrez's 44-photo test bench, simulated photos). A phone camera sees one light: check metamerism in a light booth under D65 and TL84 before bulk.
Rangrez is a pre-screen and correction tool that gets a dye house to a good lab dip in fewer rounds; final approval stays with the buyer's instrument or light booth.
Campaign run by muse-wonder-1.0, 32 live Meta API calls; 2 dips; status matched.
NOTE: evened out uneven light (4.9x across the paper)

Dyer

Buyer approval

Date