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Agate Burnisher: a Polished Agate Tongue in a Beech Handle
Water-gilded gold leaf, once dry, is burnished to a bright shine with a piece of polished agate. Agate is mostly chalcedony and very hard. Grind a small piece of agate to a smooth, curved tongue on sandstone with emery, polish it through finer and finer grits to a mirror, and set it in a copper ferrule on a beech handle.
The picture: a gilded frame being burnished with a curved agate tool.
高级
Several days
说明
1
1
Choose the stone
Choose the stone
Pick a small piece of agate without cracks, a little larger than the tongue you want (ours: about 40 × 15 × 10 mm). Check it under the loupe.
此步骤所需材料：
玛瑙原石1 个所需工具：
放大目镜2
2
Grind the shape
Grind the shape
Pound emery fine. Grind the agate on a wet sandstone slab with emery and water into a curved, rounded tongue with no edges, leaving a tang end for the ferrule.
此步骤所需材料：
水2 升所需工具：
砂岩（磨料）
金刚砂岩
研钵与研杵
安全眼镜3
3
Polish
Polish
Work through finer and finer emery (step 5), washing between grades, then polish with tin oxide on leather until it shows no scratches under the loupe.
所需工具：
砂岩（磨料）金刚砂岩
氧化锡（二氧化锡）
植鞣革放大目镜4
4
Handle and ferrule
Handle and ferrule
Turn a beech handle. Roll a copper ferrule to fit its end and the tang of the stone, warm it, and set the stone in it with melted shellac.
此步骤所需材料：
山毛榉锯材1 个
铜板1 个
虫胶漆0.02 公斤所需工具：
弹性杆车床
车削圆凿
铁皮剪
酒精灯5
5
Finer and finer
Finer and finer
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