Bellini Sodium Thiosulphate Pentahydrate - 1kg

Name: Bellini Sodium Thiosulphate Pentahydrate - 1kg
Brand: Bellini
SKU: BELL029
Price: 14.3 USD
Availability: InStock
Rating: 4.8 (5 reviews)

Bellini Sodium Thiosulphate Pentahydrate - 1kg - Main image

$14.3 ~~$22~~ In stock

Category: Film & Film Processing Raw Chemicals

Sodium Thiosulphate is a standard and universal fixing agent. This ''penta'' version with 33% water in it and is often referred to as Hypo.

The molecular formula is: Na2S2O3.xH2O

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Customer Reviews (4.8 / 5 · 5 reviews)

Carter X. ★★★★★ Oct 22, 2026

This 1kg bag of hypo is perfect for bulk mixing, and it dissolves completely clear without any grit. I finally have a reliable source for my darkroom fixer that's consistent batch to batch.

Thomas P. ★★★★★ Oct 21, 2026

I've been mixing my own fixer for years and this 1kg bag of sodium thiosulphate pentahydrate dissolves clear without any residue. The 33% water content means I can accurately calculate my working solution strength every time.

Mia E. ★★★★★ Oct 20, 2026

My fixer stock was running low for my darkroom sessions, and this 1kg penta form mixed up crystal clear with no residue left behind. The 33% water content means I had to adjust my dilution math, but the fixing action was perfectly consistent across several rolls of film.