compo quiery:rosin-linseed oil sticky mass didnt disperse
Posted: Wed 17 Jan, 2018 1:33 pm
Hello Framers & Frame specialists
I am a conservator of works of art & antiquities based in Athens, Greece and new to the forum.
I have a quiery on compo. I am using the compo recipe I have from the gilding course at Uni (227gr pearl glue + 300ml water / 99gr finely crushed rosin +115ml linseed oil - I also have another recipe with glycerin & venice turpentin, but for this particular frame repair at work, I used the simplified version).
The above recipe has worked for me fine in the past, however this very last time I made it, I had the following problem: I mixed rosin + linseed oil and in the first 15 minutes of heating the rosin looked like it had dissolved well so I proceeded in mixing it with the glue, however upon mixing of the rosin-oil mix with the glue, the rosin became a very sticky mass which did not disperse - tried a higher temperature with continuous stiring and kind of worked but as soon as the temperature fell the material gathered again in a mass. I am wondering whether I should have insisted on the first stage of rosin-oil warming & mixing more or perhaps used a higher temperature at that same initial stage ?. Any ideas on what went wrong so I can avoid repeating the same mistake?
Thanking you in advance
Greetings from Greece
Lydia
I am a conservator of works of art & antiquities based in Athens, Greece and new to the forum.
I have a quiery on compo. I am using the compo recipe I have from the gilding course at Uni (227gr pearl glue + 300ml water / 99gr finely crushed rosin +115ml linseed oil - I also have another recipe with glycerin & venice turpentin, but for this particular frame repair at work, I used the simplified version).
The above recipe has worked for me fine in the past, however this very last time I made it, I had the following problem: I mixed rosin + linseed oil and in the first 15 minutes of heating the rosin looked like it had dissolved well so I proceeded in mixing it with the glue, however upon mixing of the rosin-oil mix with the glue, the rosin became a very sticky mass which did not disperse - tried a higher temperature with continuous stiring and kind of worked but as soon as the temperature fell the material gathered again in a mass. I am wondering whether I should have insisted on the first stage of rosin-oil warming & mixing more or perhaps used a higher temperature at that same initial stage ?. Any ideas on what went wrong so I can avoid repeating the same mistake?
Thanking you in advance
Greetings from Greece
Lydia