crackle finished leather

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  • 1. WELCOME TO MYWELCOME TO MY PROJECT WORKPROJECT WORK

2. Title:Title: STUDIES ON THESTUDIES ON THE PRODUCTION OF CRACKLEPRODUCTION OF CRACKLE FINISH LEATHER FROM COWFINISH LEATHER FROM COW HIDEHIDE 3. ACKNOWLEDGEMENTACKNOWLEDGEMENT Man is the greatest creature of ALLAH. So I at first take the name ofMan is the greatest creature of ALLAH. So I at first take the name of omnipotent ALLAH who has created me as a man and whoseomnipotent ALLAH who has created me as a man and whose blessing directed me towards the accomplishment of this projectblessing directed me towards the accomplishment of this project work. I also express my deepest respect to Institute Of Leatherwork. I also express my deepest respect to Institute Of Leather Engineering And Technology where I passed my several years ofEngineering And Technology where I passed my several years of life.life. I would like to express my deepest sense of gratitude and sincereI would like to express my deepest sense of gratitude and sincere appreciation to my respectable teacher and also to Professor Dr.appreciation to my respectable teacher and also to Professor Dr. Md. Idris Ali principal of Institute of Leather Engineering andMd. Idris Ali principal of Institute of Leather Engineering and Technology, Mr. Sobur Ahmed (Assistant Professor) Head of theTechnology, Mr. Sobur Ahmed (Assistant Professor) Head of the Leather Engineering Department and thesis supervisor Md. Hanif AliLeather Engineering Department and thesis supervisor Md. Hanif Ali (from whom I got instructions to finish this project work).(from whom I got instructions to finish this project work). 4. I like to extend my heartily thanks to Mr. Abid Siddiquee who alwaysI like to extend my heartily thanks to Mr. Abid Siddiquee who always helped me to finish the leather by giving practical help and technicalhelped me to finish the leather by giving practical help and technical information about different chemicals which should be used andinformation about different chemicals which should be used and which should not.which should not. Finally, I owe a great homage to other teachers who are the assetsFinally, I owe a great homage to other teachers who are the assets of this institute, thanks to the Librarian, all the stuffs of C.F.F.C. andof this institute, thanks to the Librarian, all the stuffs of C.F.F.C. and other laboratories who directly or indirectly helped me to completeother laboratories who directly or indirectly helped me to complete this project workthis project work Sadman ProdhanSadman Prodhan April, 2012April, 2012 5. THE AIM OF THE PROJECTTHE AIM OF THE PROJECT WORKWORK The original purpose of this project work is the production of CrackleThe original purpose of this project work is the production of Crackle finished leather.finished leather. In the production of leather there are always some low quality raw hides andIn the production of leather there are always some low quality raw hides and skins. These hides when tanned produces lower grade leather. This lowerskins. These hides when tanned produces lower grade leather. This lower grade leather never gets enough prices from the buyers. So providing agrade leather never gets enough prices from the buyers. So providing a proper special effect may increase the value of these hides and skins.proper special effect may increase the value of these hides and skins. Split leathers are by product of the tanning industry. Due to quality andSplit leathers are by product of the tanning industry. Due to quality and fashion the quantity of splits produced often does not fulfill customerfashion the quantity of splits produced often does not fulfill customer demand. So there has been much experimental work to convert a split into ademand. So there has been much experimental work to convert a split into a product that looks and behaves like grain leather.product that looks and behaves like grain leather. So I have decided to do this research work on the production of crackleSo I have decided to do this research work on the production of crackle finished leather.finished leather. 6. WHAT IS CRACKLE FINISH?WHAT IS CRACKLE FINISH? Crackle is an interesting finish that gives the appearance of age on theCrackle is an interesting finish that gives the appearance of age on the surface of painted pieces. This finish is done by a commercial product andsurface of painted pieces. This finish is done by a commercial product and requires two colors of pigment - one for the undertones and the other forrequires two colors of pigment - one for the undertones and the other for the top.the top. The crackle finish includes a base coat of latex paint that is applied on aThe crackle finish includes a base coat of latex paint that is applied on a surface. A crackle coating is applied over the base coat and dried to tacksurface. A crackle coating is applied over the base coat and dried to tack dry or completely dried, latex wood filler is applied over the crackledry or completely dried, latex wood filler is applied over the crackle medium. As the latex wood filler dries, it forms islands or domainsmedium. As the latex wood filler dries, it forms islands or domains separated by cracks or valleys revealing glimpses of the underlying baseseparated by cracks or valleys revealing glimpses of the underlying base coat.coat. A crackle glaze or varnish is a finish which creates a crackled effect. ManyA crackle glaze or varnish is a finish which creates a crackled effect. Many people use crackle glazes for antiquing, because peeling, crackled paint haspeople use crackle glazes for antiquing, because peeling, crackled paint has an old-fashioned look which goes especially well with restored furniture.an old-fashioned look which goes especially well with restored furniture. Crackle g1azes can be used on a wide range of things including pottery,Crackle g1azes can be used on a wide range of things including pottery, furniture- picture frames, and even walls, a number of craft stores sellfurniture- picture frames, and even walls, a number of craft stores sell materials for crackle glazing, and we can also accomplish the effect with amaterials for crackle glazing, and we can also accomplish the effect with a few supplies we probably already have around the house.few supplies we probably already have around the house. 7. When a crackle glare is made, one color is laid down as a base coatWhen a crackle glare is made, one color is laid down as a base coat and allowed to dry before a crackling medium is painted over it.and allowed to dry before a crackling medium is painted over it. Once this medium dries, another coat of color is applied and cracksOnce this medium dries, another coat of color is applied and cracks and peels start to appear almost immediately. To seal a crackle weand peels start to appear almost immediately. To seal a crackle we place a clear varnish or polyurethane sealer can be used. Thisplace a clear varnish or polyurethane sealer can be used. This sealer also halts the crackling process so that the second layer ofsealer also halts the crackling process so that the second layer of color doesn't flake off entirely.color doesn't flake off entirely. Since the underlying color shows through, many people try to useSince the underlying color shows through, many people try to use coordinating colors when they apply a crackle glaze. Contrastingcoordinating colors when they apply a crackle glaze. Contrasting colors can also work quite nicely, like a dark under layer and a lightercolors can also work quite nicely, like a dark under layer and a lighter over-layer. If we aren't sure about how two colors will look together,over-layer. If we aren't sure about how two colors will look together, we can test them on a small area of the piece to make sure that theywe can test them on a small area of the piece to make sure that they look goodlook good Once they dry, we can also use a medium like gold, silver, or copperOnce they dry, we can also use a medium like gold, silver, or copper paint for one of the layers for a richer look.paint for one of the layers for a richer look. 8. If we cannot track down a crackling medium, we can also use whiteIf we cannot track down a crackling medium, we can also use white glue. White glue acts as a layer of resist, preventing the second layerglue. White glue acts as a layer of resist, preventing the second layer of paint from fully adhering. This will create a more mottled effect; weof paint from fully adhering. This will create a more mottled effect; we can also use wax as a resist for a crackle finish. If we are workingcan also use wax as a resist for a crackle finish. If we are working with pottery, we use a glaze which has been designed to crack, andwith pottery, we use a glaze which has been designed to crack, and follow the directions closely.follow the directions closely. The crackle glaze effect is sometimes called craqueleure and in fineThe crackle glaze effect is sometimes called craqueleure and in fine art it is sometimes used as a tool to date artworks and establish theirart it is sometimes used as a tool to date artworks and establish their provenance. Forgers spend lifetimes mastering the art of a properlyprovenance. Forgers spend lifetimes mastering the art of a properly crackled final layer of paint in the hopes that their works will passcrackled final layer of paint in the hopes that their works will pass muster by art inspectors: a dedicated forger may infuse a craqueleuremuster by art inspectors: a dedicated forger may infuse a craqueleure with dust and particulates from an old piece of art from the rightwith dust and particulates from an old piece of art from the right region in case an art inspector decides to chemically analyze theregion in case an art inspector decides to chemically analyze the finish.finish. 9. Objects of Crackle finish:Objects of Crackle finish: To make a fashionable a

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