Saturday, February 2, 2019

Chemical Finishes - Acid Finishes
Art Resource

Marie-Therese Wisniowski


Preamble
This is the eighty-fifth post in the "Art Resource" series, specifically aimed to construct an appropriate knowledge base in order to develop an artistic voice in ArtCloth.

Other posts in this series are:
Glossary of Cultural and Architectural Terms
Units Used in Dyeing and Printing of Fabrics
Occupational, Health & Safety
A Brief History of Color
The Nature of Color
Psychology of Color
Color Schemes
The Naming of Colors
The Munsell Color Classification System
Methuen Color Index and Classification System
The CIE System
Pantone - A Modern Color Classification System
Optical Properties of Fiber Materials
General Properties of Fiber Polymers and Fibers - Part I
General Properties of Fiber Polymers and Fibers - Part II
General Properties of Fiber Polymers and Fibers - Part III
General Properties of Fiber Polymers and Fibers - Part IV
General Properties of Fiber Polymers and Fibers - Part V
Protein Fibers - Wool
Protein Fibers - Speciality Hair Fibers
Protein Fibers - Silk
Protein Fibers - Wool versus Silk
Timelines of Fabrics, Dyes and Other Stuff
Cellulosic Fibers (Natural) - Cotton
Cellulosic Fibers (Natural) - Linen
Other Natural Cellulosic Fibers
General Overview of Man-Made Fibers
Man-Made Cellulosic Fibers - Viscose
Man-Made Cellulosic Fibers - Esters
Man-Made Synthetic Fibers - Nylon
Man-Made Synthetic Fibers - Polyester
Man-Made Synthetic Fibers - Acrylic and Modacrylic
Man-Made Synthetic Fibers - Olefins
Man-Made Synthetic Fibers - Elastomers
Man-Made Synthetic Fibers - Mineral Fibers
Man Made Fibers - Other Textile Fibers
Fiber Blends
From Fiber to Yarn: Overview - Part I
From Fiber to Yarn: Overview - Part II
Melt-Spun Fibers
Characteristics of Filament Yarn
Yarn Classification
Direct Spun Yarns
Textured Filament Yarns
Fabric Construction - Felt
Fabric Construction - Nonwoven fabrics
A Fashion Data Base
Fabric Construction - Leather
Fabric Construction - Films
Glossary of Colors, Dyes, Inks, Pigments and Resins
Fabric Construction – Foams and Poromeric Material
Knitting
Hosiery
Glossary of Fabrics, Fibers, Finishes, Garments and Yarns
Weaving and the Loom
Similarities and Differences in Woven Fabrics
The Three Basic Weaves - Plain Weave (Part I)
The Three Basic Weaves - Plain Weave (Part II)
The Three Basic Weaves - Twill Weave
The Three Basic Weaves - Satin Weave
Figured Weaves - Leno Weave
Figured Weaves – Piqué Weave
Figured Fabrics
Glossary of Art, Artists, Art Motifs and Art Movements
Crêpe Fabrics
Crêpe Effect Fabrics
Pile Fabrics - General
Woven Pile Fabrics
Chenille Yarn and Tufted Pile Fabrics
Knit-Pile Fabrics
Flocked Pile Fabrics and Other Pile Construction Processes
Glossary of Paper, Photography, Printing, Prints and Publication Terms
Napped Fabrics – Part I
Napped Fabrics – Part II
Double Cloth
Multicomponent Fabrics
Knit-Sew or Stitch Through Fabrics
Finishes - Overview
Finishes - Initial Fabric Cleaning
Mechanical Finishes - Part I
Mechanical Finishes - Part II
Additive Finishes
Chemical Finishes - Bleaching
Glossary of Scientific Terms
Chemical Finishes - Acid Finishes
Finishes: Mercerization
Finishes: Waterproof and Water-Repellent Fabrics
Finishes: Flame-Proofed Fabrics
Finishes to Prevent Attack by Insects and Micro-Organisms
Other Finishes
Shrinkage - Part I
Shrinkage - Part II
Progressive Shrinkage and Methods of Control
Durable Press and Wash-and-Wear Finishes - Part I
Durable Press and Wash-and-Wear Finishes - Part II
Durable Press and Wash-and-Wear Finishes - Part III
Durable Press and Wash-and-Wear Finishes - Part IV
Durable Press and Wash-and-Wear Finishes - Part V
The General Theory of Dyeing – Part I
The General Theory Of Dyeing - Part II
Natural Dyes
Natural Dyes - Indigo
Mordant Dyes
Premetallized Dyes
Azoic Dyes
Basic Dyes
Acid Dyes
Disperse Dyes
Direct Dyes
Reactive Dyes
Sulfur Dyes
Blends – Fibers and Direct Dyeing
The General Theory of Printing

There are currently eight data bases on this blogspot, namely, the Glossary of Cultural and Architectural Terms, Timelines of Fabrics, Dyes and Other Stuff, A Fashion Data Base, the Glossary of Colors, Dyes, Inks, Pigments and Resins, the Glossary of Fabrics, Fibers, Finishes, Garments and Yarns, Glossary of Art, Artists, Art Motifs and Art Movements, Glossary of Paper, Photography, Printing, Prints and Publication Terms and the Glossary of Scientific Terms, which has been updated to Version 3.5. All data bases will be updated from time-to-time in the future.

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The Art Resource series will be the first post in each calendar month. Remember - these Art Resource posts span information that will be useful for a home hobbyist to that required by a final year University Fine-Art student and so undoubtedly, some parts of any Art Resource post may appear far too technical for your needs (skip over those mind boggling parts) and in other parts, it may be too simplistic with respect to your level of knowledge (ditto the skip). The trade-off between these two extremes will mean that Art Resource posts will hopefully be useful in parts to most, but unfortunately may not be satisfying to all!


Acid Finishes
Transparent (or parchment) effects in cotton cloth are produced by treatments with strong sulfuric acid. One of the oldest finishes is Swiss or organdy finish produced by the Heberlein process. Since acid damages cotton, the process must be carefully controlled, and "split second" (five to six seconds) timing is necessary to prevent tendering or weakening of the fabric. These effects are possible : all-over parchmentization, localized parchmentization, and plissé effect on either side of the first two.

Nicholas Vintage Organdy Mini Dress.

Since all-over parchmentizing is for the purpose of producing a transparent effect, a sheer fabric of combed lawn is used. The goods are singed, desized, bleached and mercerized. Mercerization is such an important part of the process that the fabric is mercerized again after the acid treatment in order to improve transparency. The fabric is then dyed or printed with colors that will resist acid damage. The cloth is immersed in the acid solution and partial removal of the surface of the cellulose takes place. Upon drying, this surface rehardens as a cellulose film and gives permanent crispness and transparency. After the acid treatment, the cloth is neutralized in a weak alkali, washed and then calendared to give more gloss to the surface. This all over treatment produces organdy fabric.

2013 High-end embroidered organza dress.
Note: The word organdy originated around 1825-1835 from the French word organdi. The word is also sometimes spelled organdie.

In localized parchmentizing, if the design is a small figure with a large transparent area, an acid-resist substance is printed on the figures and the fabric is run through an acid bath. The acid-resistant areas retain their original opacity and contrast sharply with the transparent background.

Localized parchmentizing - acid finish - gives a transparent background.

If a small transparent design is desired, the acid is printed on and then quickly washed off.

The three dimensional plissé effect is achieved by printing caustic soda on the parchmentized fabric. The untreated areas pucker as the caustic soda causes the printed areas to shrink. The plissé effect can also be made on fabric with local parchmentization.

Elie TahariNeila Floral Lace-Trim Plissé Blouse.

Burnt-out or etched effects are produced by printing sulfuric acid on fabric made of fibers from different fiber groups, rayon and silk, for example. The rayon will be eaten away leaving sheer silk areas.

Cheongsam Ruhuashijin: Low Silk Burnt-Out Velvet Fabric Silk Dress.

Carbonizing, which is the treatment of wool yarns or fabrics with sulphuric acid, destroys vegetable matter in the fabric and more level dyeing can be obtained. Carbonizing is also done on reused and reprocessed wool to remove any cellulose that may have been used in the original fabric. Carbonizing gives better texture to all-wool fabrics.

Australian carbonized wool.

Puckered surfaces are created by introducing a partial solution to the surface of nylon or polyester fabric. Plissé, sculptured, and "damasque" effects are made by printing a chemical on the fabric to partially dissolve it. Shrinking occurs as it dries, thus creating a puckered surface.

Removing a nylon "damasque" housecoat from an automatic dryer after washing.


Reference:
[1] N. Hollen and J. Saddler, Textiles, 3rd Edition, MacMillan Company, London (1968).

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