Varnishes (lacquers) for copper parts for picklehaube

[kenny_k]

Methods of protecting copper or brass have been known in Europe since the 12th century. Lacquers were made from natural resins such as shellac in various shades. Colouring agents such as lead chromate were added to them.
The general recipe from the early 20th century for a small colour coating is as follows: 1 part lac and shellac, 0.5 parts Venetian turpentine, 30 parts wine spirit.
An example in the photo of my fireplace handle restoration in different paint colours.

 

[Naprawiacz]

It came out elegantly,congratulations!

 

[Sandmann]

Very interesting, thank you for all your efforts

 

[kenny_k]

Here is an example of chemical cleaning from grease and brightening. Without polishing the brass. With the varnish applied from the recipe I gave earlier.

 

[kenny_k]

Another example of lacquer. A recipe from the 19th century from opaque to bright gold. All that remains is to carry out the polishing with linseed oil.

 

[John Josef]

Another example of lacquer. A recipe from the 19th century from opaque to bright gold. All that remains is to carry out the polishing with linseed oil.

Hello Kenny,

Welcome to the forum, you have incredible talent regards John Josef

 

[kenny_k]

Today I bought some wappen restoration dyes. Probably the varnishes will come out well. I'm waiting for the other materials to arrive.

 

[Ryanpyc]

Hi KennyI
Follow your every post with curiosity and admiration.I have a question to ask you, excuse my ignorance on the subject, in the first recipe of the post the first ingredients you mention are: "1 part lac and shellac"
1) What do you mean by LAC?
2) It would be "1 part lac + 1 part shellac" or only one of the two ingredients, of your choice.
3) The dye, lead chromate, as well as being very toxic, is not very soluble. How do you calculate the dose? What alternatives are there to chrome?
Thank you in advance for your time

Greetings

 

[kenny_k]

Lac https://en.m.wikipedia.org/wiki/Sealing_wax

 

[kenny_k]

Shellac https://www.wikiwand.com/en/Shellac

 

[Ryanpyc]

Many thanks Kenny, I hope I can return the kindness
Greetings
Rino

 

[kenny_k]

Only lac I make myself, because it is a different recipe from the modern one. I think there are two types of shellac, Venetian turpentine, two types of gypsum, dye, turpentine oil.