Showing posts with label steam. Show all posts
Showing posts with label steam. Show all posts

Thursday, June 27, 2013

Box Project 4 - Cleaning off that Old Veneer



The first step in redoing the box is to get it down to a clean surface that I can work with which brings me to removing the veneer.  I got the greater part of the old veneer off with just my fingers.  But there was the rest of it that was clinging on for dear life. 
I could tell by the brown crystals I could see in the wood grain that the original veneer had been put on with hide glue - the real stuff cooks out of animal tendons and hooves and such.  It is still used today particularly on things like musical instruments.  The reason for this is that it has the excellent property of holding things like iron while dry and letting go when it is heated with steam.  That way a guitar or violin that has been assembled with it can be disassembled for repair without damaging the wood.  I wrote a small book on this a while back.  (Heath, Maya, A Practical Guide to Medieval Adhesives, Issue 134 of The Compleat Anachronist, Society for Creative Anachronism, 2007.) I did a lot of research and experimentation with various kinds of pre-industrial glue for this. What made me cautious was the delicate under surface of the carcasse wood and the less than robust condition of the box as a whole.  I didn't want to have to do a lot of digging and prying to get it to let go.  All the blogs and videos on the internet I could find deal with flat surfaces.  Getting steam and heat to this compound curve were going to be a challenge. 
I took an old wash rag and got it wet just a little drier than dripping, folded is in thirds and laid it on the veneer I wanted to remove.  I took an iron and heated it up to maximum, then laid it on the wash rag. 
I didn't leave it on there long - maybe 10 seconds while I picked up the camera and took a couple of pictures.  There wasn't much danger of the rag burning as it was hissing and chortling steam like crazy.  Then I lifted it off.
Using an old cake spatula I began to try lifting the edges - GENTLY.  You don't want to be digging at the wood, just letting the heat and steam do its work.  The edges began to lift up.  I had to apply the rag and iron a couple of more times before it lifted away altogether.  The key here is that you have to work with the glue and veneer are still really warm to the touch.  Once it cools, its set again. 

It took a bit of patience working one area at a time.  It didn't always come off in convenience large pieces, but eventually it did all come off. 
Now it needs to sit a while drying out.  I didn't get it damp to the touch, but all that steam forces itself into the wood grain.  So it needs a few days peace and quiet before I hand it over to Phillip to glue back together.

Friday, June 21, 2013

Box Project 2 - Bits and Beginnings

My first step with the box is to get it to the point that it can be glued.  Right now its covered in pealing shards of veneer.  some of it has come off with the slightest touch; some of it needed a little help from fingernails and a palette knife.  The rest is proving to be stubborn.  I can tell from the brown/amber crystals here and there when the pieces pop off that it was all originally put on with hide glue.  This may prove to be a blessing in disguise because I know from the research I did for the glue book that hide glue will let go with steam.  So probably tomorrow I will address the issue with hot damp towels and a steam iron.  The Phillip can glue the very loose pieces back together. 

That being said, I've turned my attention to how I will eventually decorate it.  Neither Phillip nor I have the time, patience or (probably) skill to redo the veneer entirely.  But in my researches I have found that many of the boxes like this were decorated with paint in a technique called "penwork". 
It comes in two varieties, polychrome and monochrome. Often it is decoration in gold or color on black.  Sometimes it is similar decoration on gold or ocher and sometimes a combination of the two with side panels in a decorative motif in monochrome with a figural panel on the top in polychrome or vice versa. 



 But as you can see, it isn't limited to that either.  There is also red backgrounds and verdigris green.  Unlike Medieval and Renaissance boxes referred to as "polychromed wood", these boxes seem to be done in a process more akin to Russian Palek boxes.  A box is covered first with a primer, then several layers of black lacquer.  Then the design is put on in metallic paint and painted over with colors.  The whole thing is then covered with several layers or clear lacquer.  (http://www.russianamericancompany.com/lacquer-box-making/) This is a lot more robust and durable than regular polychroming which is paint over layers of gesso.  I think I can make a decent stab at pretty design work that, while it may not be up to Palek box standards, may be nicely done nonetheless.  Time to dig out my air brush and see if it will suit the lacquer.

And while we're on the subject, how about those brass hairy paw feet.  I know I can do them as I already made feet like that for another box and I still have all the molds.  All-in-all this may take what seems like forever, but if I'm careful and do it right it could turn out splendidly.  Be that as it may, I still have to be about the very tedious business of removing that veneer.  But its dreams like this that keep me going.