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Zinc Sulphide Phosphor: Precipitated Sulphide Heated to Redness with a Flux (Thorpe 1913)
Precipitated zinc sulphide does not glow. Heated to redness together with an alkali chloride or the sulphide of another metal, it turns into the phosphorescent sulphide used for fluorescent screens.
Source: Thorpe, Dictionary of Applied Chemistry vol. 5 (1913), Zinc. Unknown: which chloride or sulphide, how much, and for how long. Thorpe names only the class, so the additive is linked to an unknown head. Crucible and furnace are ours. Picture drawn by Youblob.
Kati
1 day
Maagizo
1
1
Mix the sulphide with the additive
Mix the sulphide with the additive
Grind precipitated zinc sulphide together with an alkali chloride or the sulphide of another metal. Unknown: which one and how much. Thorpe names only the class.
Vifaa kwa hatua hii:
Salfaidi ya zinki1 as required
Kiyeyusho kisichojulikana1 as requiredZana zinazohitajika:
Kinu na mchi2
2
Heat to redness
Heat to redness
Heat the mixture to redness (ours: in a lidded porcelain crucible in a muffle furnace). Unknown: for how long. Let it cool.
Zana zinazohitajika:
Kikaango cha kuyeyushia chenye mfuniko (kaure)
Tanuri ya muffle
Koleo la kaure ya kuyeyushia
Glavu Zinazostahimili Joto3
3
Check the glow
Check the glow
Grind the cooled cake gently. Expose a little to light, then look at it in the dark: the phosphorescent sulphide glows.
Zana zinazohitajika:
Kinu na mchiVifaa
2- 1 as requiredKishikilia Nafasi
- 1 as requiredKishikilia Nafasi
Zana Zinazohitajika
5- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
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