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Acid Milling Dyes

Acid Dyes

Acid dyes are water soluble anionic dyes which are applied to fibers such as silk, wool, nylon & modified acrylic fibers from neutral to acid dye baths. Attachment to the fiber is attributed, at least partly, to salt formation between anionic groups in the dyes and cationic groups in the fiber. Acid dyes are not substantive to cellulosic fibers. Acid dyes are used both commercially and by the studio dyer to dye protein/animal fibers such as wool, silk, mohair, angora, alpaca and some nylons and synthetics. Acid dyes require the use of an acid such as vinegar, acetic or sulfuric acid to set the color.

Acid dyes sound scary to some novices, who imaging that the dyes themselves are caustic strong acids. In fact, the dyes are non-caustic, are in many cases non-toxic, and are named for the mild acid (such as vinegar) used in the dyeing process, and for the types of bonds they form to the fiber. Some of them are significantly more toxic than fiber reactive dyes, while others are even safe enough to eat, and are sold as food coloring.

Acid dyes are classified into several classes: 1, leveling acid or strong acid dye, 2, super milling or fast acid or neutral acid dyes 3, milling or weak acid dyes, and. Leveling Acid Dyes are been sold under the trade names of Kiton, Erio, Intracid, Sandolan, and Amacid, among others; they are also the acid dye component of all-purpose or union dyes such as Rit and Tintex, says Knutson. It's difficult now to find out which specific acid dyes fall into which of these dye classes, however. At least part of the reason is that the information is not particularly useful to the dyer.

Most histologic dyes are distinguished as acid or as basic dyes. An acid dye exists as an anion (negatively charged) in solution, while a basic dye exists as a cation (positive charge). For instance, in the hematoxylin-eosin stain (H&E), the hematoxylin-metal complex acts as a basic dye. The eosin acts as an acid dye. A very large class of dyes containing acidic groups, such as the sodium salts of sulfonic acids or phenolic groups. They are more soluble and have less tinctorial value than basic dyes but they also have greater light fastness. They do not form lakes with tannin. Acid dyes are used in dyeing leather, paper, etc., and their particular value lies in their ability to produce brighter, more uniform colors. They are normally applied from acid dye liquor (acetic, formic, or sulfuric acid); however, unless applied from a neutral or only slightly acid dyebath, i.e., pH of 6.0 to 7.0, their use is likely to result in acid degradation of the material dyed.

Shade Card

1.   Yellow Fast
2.   Yellow T
3.   Yellow MY
4.   Yellow N-5GN
5.   Yellow 5GN
6.   Orange ll
7.   Orange NR
8.   Rose 2G
9.   Scarlet 3G
10.   Red NG
11.   Red NGRS
12.   Red NRS
13.   Red GRC
14.   Red RS-M
15.   Red A
16.   Scarlet G
17.   Red 3BN
18.   Red F2R
19.   Red RC
20.   Red 10B
21.   Maroon V
22.   P. Blue AS D/C
23.   Navy Blue S5R
24.   Blue BLC
25.   Green LP
26.   Green SF
27.   Resorcine Brown R
28.   Black 10 BX
29.   Black NG
30.   Black FGO

Please note that the colours on this document are for demonstration purposes only as colours vary with individual monitors and therefore cannot be guaranteed as accurate.



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