Quote:The Berlin Murmillo helmet is currently worked on, AFAIK the publication will also include some info on the metallurgy...
http://www.uwepeltz.de/pages/leistungen/..._lang.html
For those who speak english:
Concept for the restoration of the Gladiator helmet of Antiquities Berlin
State before restoration (Fig. 1 & 2)
Cracks and voids
- Right neck protection, with a slight deformation
- Some of the brim
- Several of the dome, particularly in the end region with a significant deformation of the breaking edges (Fig. 3)
- On in many areas Busch Box
many places until it rests loosely sintered layer
to tin (Fig. 4):
- Received mostly good
- Converted sporadically black oxide (Fig. 5)
- Chipped occasionally to considerable corrosion of the base metal (. Eg: re side bush box) (Fig. 6)
- Covered in other areas of sinter or corrosion products of the base metal (Fig. 7)
The old restorations
Description
Solders on cracks on the left side of the field:
- Directly at the transition to the dome (Fig. 8 )
- Close to the edge
Solders on all edges of the mounting bush box (Figure 9)
Solders on the tube hinges
Solders on both neck fenders
Soldering the visor mount on both fenders neck (Fig. 10)
Soldering of the eye on the top edge of the left half visor
Addition of portions of the U-shaped edge pushed sheet
Addition of large parts of the rim (Fig. 11 and 12)
Complement the front of the bush box (Fig. 13)
Complement associated with the right neck region retardants strut Intent
Complement the eyelet at the top of the left half visor
Execution of Altrestaurierungen
Soldering
- Solder
- On sheet quality and very thin (slightly thicker than the antique plate thickness) (Fig. 14)
- On castings very cautious and precise
- Touch the silver solder joints according to an archaeological patina (possibly earth pigments and / or grated corrosion products, and sand) (Fig. 15)
Supplements made from sheet metal
- Preparation of brass sheets according to the shape of the defect and the course of the ancient broken edges (Fig. 14)
- Engraving of the checkerboard pattern to match the original
- Full complement of tinning on the rim (Fig. 16) (possibly also at Busch box)
- High quality soft soldered (see above)
- Retouch the entire complement (see above)
Complement of the eye and the center bar
- Added working parts made of brass
- Possibly patination
- Soldering
- May correspond to a partial retouching archaeological patina
A sample of at 7:05:03 Malmittels was submitted for analysis of the binder and the pigments to the RFL.
Proposal for restoration
Processing of the ancient original
Cleaning of the surface
where possible, exposing the tin:
First Decrease in the sintering conditions on the outside. The sintering on the inside remains the object:
(Tests run)
- Mechanically
- Chemically
Second Reduction of corrosion products:
- Mechanically
(Tests run)
where possible reshaping of deformations
Bonding of cracks with reversible material
Addition of flaws and retouching of supplements with reversible material
any preservatives
Making a stand
Processing of old restorations
It is proposed to keep the old restoration to the original. The materials used are not harmful for the original effect. Your acceptance or partial acceptance would affect the visual impact of the helmet negative. It is necessary, if appropriate, whether for reasons of documentation, the "window" at the back of the brim is left.
graphic and photographic documentation of the supplements
Create a "window" to the complement of the brim and its documentation (already at the brim is) (Fig. 16)
Retouching of the "window" in accordance with the surrounding colors
Analysis of the materials used
Evaluation and comparison with restoration methods of the 18th and 19 Century Naples (e.g. on bronzes from Boscoreale)
Documentation of the restoration
Written, graphic and photographic documentation of the restoration steps
Documentation of the ancient traces of the same type
Documentation of Altrestaurierungen the same way
Documentation of technological information in the same way