Which Procion MX dyes discharge the best? Which are good at resisting chlorine bleach?

This is a gathering of notes found online regarding dischargeability of dichlorotriazine (Procion MX type) dyes, for the sake of comparison. See the links at the bottom for the sources from which these data were pulled. Do not miss Dharma’s Bleach Thickener for Discharging page, which includes tables of dyes that discharge well or moderately with hypochlorite bleach, including the sometimes surprising colors that result from bleaching many of their proprietary mixed colors.

The column at left gives the generic MX codes commonly used, and the Colour Index names for each of these reactive dyes. To translate these into the names used by your supplier, see the page,Which Procion MX colors are pure, and which mixtures?.

Hypochlorite bleach is ordinary household bleach, NaClO. It is an oxidative bleach which works by breaking up dye molecules. Sometimes the fragments of dyes possess a color of their own, resulting in interesting color changes.

Reductive discharge agents acts by producing sulfur dioxide in the fiber. They work by chemically reducing double bonds to single bonds. All reductive discharge agents are expected to have similar results to each other, which may be very different from those of oxidative bleaches. Reductive discharge agents include thiox, sodium hydrosulfite (Rit Color Remover), formusol, and Jacquard Discharge Paste, in addition to other formulations.

dichlorotriazine dye generic names	Dharma hypochlorite discharge	ICI hypochlorite resistance (1-5)	Asian Dyes hypochlorite resistance (1-5)	Asian Dyes reductive discharge	Orco notes	summary
yellow MX-8G C.I. r. yellow 86	low: discharges to light yellow	2	1	Good		Good yellow for discharge
yellow MX-6G CI r. yellow 1	n/a
yellow MX-4G CI r. yellow 22	n/a	1	1	Good		Good yellow for discharge
yellow MX-GR CI r. yellow 7	low: lighter golden yellow	-	4 to 5	Poor	Not discharge- able	Looks like possibly the best yellow for resisting discharge
yellow MX-3R(A) CI r. orange 86	not mentioned	4 to 5	2 to 3	Poor
orange MX-G CI r. orange 1	n/a	-
orange MX-2R CI r. orange 4	not mentioned	4	3	Poor
brown MX-GRN CI r. brown 23	n/a	-	-	-
red MX-G CI r. red 5	n/a	-			Discharge- able for light shades
rubine MX-B CI r. red 6	n/a	-
red MX-5B CI r. red 2	high: beige	1	1	Poor	Discharge- able for light shades
red MX-8B CI r. red 11	low: light magenta	-	4W^* BI^*	Poor	Discharge- able for light shades
Pink MX-B CI r. red 74	n/a	-	2	Poor
magenta MX-B CI r. violet 13 (best guess)	n/a	-	3	Poor to Fair
violet MX-2R (violet MX-G) CI r. violet 14	not mentioned	-	3	Poor
blue MX-R CI r. blue 4	not mentioned	3 to 4	2D^*	Poor	Not Discharge- able
blue MX-G CI r. blue 163	high: almost white	1	-	-		Looks like the best discharge- able blue
navy MX-3R CI r. blue 9	n/a	-	-	-
blue MX-2G CI r. blue 109	high: gray	-	-	-
blue MX-4GD CI r. blue 168	n/a	-	-	-
turquoise MX-G CI r. blue 140	low: light turquoise	-	1	Poor

^*The letters indicate the following changes in shade: Br - brighter ; D - duller; S - stronger; W - weaker; R - redder; Bl - bluer ; Y - yellower; G - greener.

Which Procion MX dyes discharge the best? Which are good at resisting chlorine bleach?

Sources: