March 15,2011
Paul, Peter Stanford, Mike MacLean, Wayne, Wilson, Rick, Naq, Mathew, Miles,
Lawrence, Robert, Chris, Frank Chaison
Leo discussed Lacquer.
The origin of lacquer is from the Rhus tree, whhich grows in Japan and China. The sap of the wood is the essence of lacquer.It is poisonous. Sumac is a local tree that is in the same family.
Natural lacquer is durable. It needs moisture to cure.
Leo told the story of a shipwreck that was discovered in an Archipelago around Japan/China. The ship had a cargo of Lacquerware (paper that was coated numerous time with lacquer until it was hard) andd when it was raised the items were in pristine condition even after 500 years in salt water!
France discovered that bugs that ate the Rhus tree were full of lacquer and it could be crushed out of them.
Alcohol was used as a solvent for it.
The French used red wine for this!
White shellac can be mixed with fillers such as soot, Tempera to form a colored finish.
It dries fast and if one adds a second coat, it will dissolve the first coat so one works quickly.
Modern lacquer is made from Nitrocelluloids with other additives to make it flexible (since wood is constantly moving).
Mix white shellac with any Tempra colors.
Shellac flakes dissolve in alcohol or methyl hydrate.
Orange shellac is the better quality.
Fillers such as limestone (CaCO3), Portland cement,Mesussa cemeent, and whiting can be used with Masonary bond to form excellent pore fillers for open grain woods.
Gorilla glue has to be applied to wet wood.
It has a short shelf life.
Leo asked that everyone do a candle vase template for the next session.
This was described in previous minutes.
Leo and Robert went over the method for enlarging an irregulat sketch using a compass and bevel to transfer measurements.
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| Transfering Drawings and Ecceentric turning and sanding |
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