الذهب
Egypt
18th Century
Source: Al-Jabarti, 'Abd al-Rahman. Aja'ib al-Athar fi al-Tarajim wa-al-Akhbar.
Recipe Details
Ingredients
Gold, Brass (Nahas Asfar)
Preparation Steps
The instrument was constructed using yellow copper (brass) spheres. The stars and constellations were engraved ('naqasha') onto the metal, along with latitudes and inclinations. Arabic names were written on the surface, and finally, the entire assembly was gold-plated ('talâ-hâ bi-al-dhahab') (p. 139).
Original Recipe Text
The instrument was constructed using yellow copper (brass) spheres. The stars and constellations were engraved ('naqasha') onto the metal, along with latitudes and inclinations. Arabic names were written on the surface, and finally, the entire assembly was gold-plated ('talâ-hâ bi-al-dhahab') (p. 139).
Evidence
"كرات من النحاس الأصفر ، ونقش عليها الكواكب المرصودة وصورها ... وكتب عليها أسماءها بالعربي ، ثم طلاها بالذهب"
Remarks
This demonstrates the use of gold as a protective and decorative coating in scientific instruments during the 18th century in Cairo. The gold plating served both to highlight the engraved details and protect the brass from oxidation (p. 139).
Scientific Analysis
Chemical CompositionAu
Certainty Level
Inferred
Instrumentally Verified
Not Verified
Metadata
Material Type
pigment
Colorذهبي
RegionEgypt
Approx. Year1750
Source Information
AuthorAl-Jabarti, 'Abd al-Rahman. Aja'ib al-Athar fi al-Tarajim wa-al-Akhbar.
CollectionCairo
Language
N/A
AI Suggestions
Find similar recipes based on ingredients and preparation methods.