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Slow oxidation of the developer, extend shelf life.

Preservatives / antioxidants

Sodium sulfite (sodium sulphite) Na2SO3 Natriumsulfit Hypo clear - 1000g

Vendor: SYNTHETIKA

Price:

188,03 Kč

incl. 23% TAX, final price will be adjusted to your country VAT rate, excl. shipping

Net price: 152,89 Kč

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Sodium sulfite (sodium sulphite) Na2SO3 Natriumsulfit Hypo clear - 100g

Vendor: SYNTHETIKA

Price:

70,52 Kč

incl. 23% TAX, final price will be adjusted to your country VAT rate, excl. shipping

Net price: 57,31 Kč

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Sodium sulfite (sodium sulphite) Na2SO3 Natriumsulfit Hypo clear - 25 000g = 25kg bag

Vendor: SYNTHETIKA

Price:

3 501,89 Kč

incl. 23% TAX, final price will be adjusted to your country VAT rate, excl. shipping

Net price: 2 847,05 Kč

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Sodium sulfite (sodium sulphite) Na2SO3 Natriumsulfit Hypo clear - 5000g

Vendor: SYNTHETIKA

Price:

822,58 Kč

incl. 23% TAX, final price will be adjusted to your country VAT rate, excl. shipping

Net price: 668,75 Kč

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Sodium sulfite (sodium sulphite) Na2SO3 Natriumsulfit Hypo clear - 500g

Vendor: SYNTHETIKA

Price:

117,51 Kč

incl. 23% TAX, final price will be adjusted to your country VAT rate, excl. shipping

Net price: 95,52 Kč

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Developers oxidize when exposed to air (and also as they reduce silver halide). Oxidation turns active developing agents into inactive byproducts, causing weaker activity, color changes (browning), and sometimes sludge. Preservatives slow this down by scavenging oxygen and keeping the developing agents in their reduced, active form.