Santisima Trinidad

Joined
Apr 25, 2019
Messages
212
Points
203

Nothing so fancy, I just tried everything I could think off, and when nothing gave the result I was looking for I started combining methods until I reached this

My job is bringing pain and fear... I'm a dentist
 
Joined
Jan 15, 2020
Messages
53
Points
78

Thanks for the reply. You have good intuition. I was chemist working in pulp and paper field before I was retired. Bleaching paper pulp used lots of redox and optical brightener.

Michel
 
Joined
Jan 15, 2020
Messages
53
Points
78

Hi Jimsky, LOL.
From memory, I suspect this kind of process :

1- Vinegar : clean the surface, and add CH3COOH on copper surface.
2- Ammonia, NH3, not ammonium NH4+, made a complex with vinegar and copper. Vinegar transform in acetate and ammonia to CuNH4 and made a complex.
3- Salt, NaCL, take place of ammoium in CuNH4. This live CuCl2 + NH3 + CH3COO- Cl+.

Well, maybe I should reopen by chemistry book. May be too Shelk can confirm, or younger chemist in the forum ?

Have a good day,

Michel
 
Joined
Apr 25, 2019
Messages
212
Points
203

The vinegar definetly helps with oxidation

My problem without combining methods was always, I would either get dark copper without patina, or patina on bright copper


The patina forms just with amonia even without salt, the salt was at least in my mind at the start to create more patterns in the patina

But compared to using sawdust looks to me that using salt creates thicker patina, so it seems that the salt is taking part on the process
 
Joined
Apr 25, 2019
Messages
212
Points
203

i can really use input on how you guys thing the stern is coming along

not fishing for compliements here, i'm making thi from scratch and making things up as i go along, so any input is apreciated
 

Maarten

Moderator
Staff member
Moderator
Joined
Sep 10, 2017
Messages
1,785
Points
528

Location
The Netherlands
i can really use input on how you guys thing the stern is coming along

not fishing for compliements here, i'm making thi from scratch and making things up as i go along, so any input is apreciated
Your work looks great but what I notice is that in the stern the window frames become bigger when we go from the lower gallery up to the middle and top gallery. In the side windows the top and second gallery windows are both the same size?
 
Joined
Apr 25, 2019
Messages
212
Points
203

Thank you @Jim J

@Maarten that was really a hard decision to make, all windows are smaller going from bottom to top, both on the back and on the sides, the issue is with the frames, on the back each floor "drops 1 frame", this worked exactly as I wanted on the square windows of the back
But on the sides the shape of the windows on the top floor, with only 1 frame looked weird to me, and ended up deciding that not matching the back would be better, but nice catch and thanks for the input

Today's progressIMG_20200429_012229.jpgIMG_20200428_184717.jpgIMG_20200428_181509.jpg
 
Top