藥典: Sodium Metaborate(偏硼酸鈉)

since: 2018/08/05
update:
2018/08/05

reference:
1. The Darkroom Cookbook 4th Edition
2. 偏硼酸鈉 - 維基百科,自由的百科全書


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Sodium Metaborate(偏硼酸鈉) (p.216)

Trade Names: Kodak Balanced Alkali, Kodalk.
商品名稱:Kodak 平衡鹼,Kodalk。

Appearance: White crystals.
外觀:白色晶體。

Uses: As a mild alkali accelerator in developers of moderate to high alkalinity.
用途:用作中鹼濃度高的鹼性促進劑。

Use to avoid the creation of gas when it comes in contact with an acid.
用於避免在與酸接觸時產生氣體。

For this reason the possibility of blister formation is minimized.
因此,最小化了水皰形成的可能性。

Substitutions: Sodium metaborate, octahydrate(8H2O), and Balanced Alkali(Kodalk) are,
for all practical purposes, the same. Substitution can be made weight for weight.
取代:對於所有實際目的,偏硼酸鈉,八水合物(8H 2 O)和平衡鹼(Kodalk)是相同的。 替代可以是重量的重量。

According to the Kodak Professional handbook(UK) a 10% solution of Kodalk/sodium metaborate,
octahydrate, can be made by mixing 14.5g of sodium hydroxide and 69.0g of borax, decahydrate,
in water to make 1.0 liter(20.0ml of a 10% solution = 2.0g; 25.0ml = 2.5g; etc.)
根據柯達專業手冊(英國),可以通過將14.5克氫氧化鈉69.0克硼砂在水中混合製成1.0升, 而可以等價於 Kodalk /偏硼酸鈉 的 10% 即 100ml.
(20.0ml 的 10%溶液 = 2.0g; 25.0ml = 2.5g;等等)

p.s. 因此可以藉由將 1.45gsodium hydroxide(氫氧化鈉)6.9gBorax(硼砂) 來替代 10gKodalk (偏硼酸鈉)

This can be made using Red Devil Lye and 20 Mule Team Borax and safely used in formulas as a substitute.
這可以使用 Red Devil Lye 和 20 Mule Team Borax 進行,並安全地用於配方中作為替代品。

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