Using magnetic stirrer and Xtol oxidation.

[Radost]

Would a magnetic stirrer oxidizes XTOL enough to reduce development?
Anybody using a magnetic stirrer to mix XTOL?

 

[RalphLambrecht]

Would a magnetic stirrer oxidizes XTOL enough to reduce development?
Anybody using a magnetic stirrer to mix XTOL?

I use a magnetic stirrer to mix all processing chemicals, but I don't turn it up so high. I try to avoid air bubbles.

 

[lamerko]

Definitely not. Xtol contains a large amount of sulfites and sequestrants. In fact, that’s why it dissolves slowly. What can actually kill Xtol is the presence of metal ions - iron and copper. The sequestrants should take care of them, but still… Using tap water is far riskier than using a magnetic stirrer - tap water has a high level of dissolved oxygen, hydrogen compounds, carbonates, and potentially metal ions. Also, tap water can have significant pH variations. If you want peace of mind, just use deionized water.

 

[mshchem]

As long as the vortex doesn't drag in air. I use a prop type mixer, variable speed. Magnetic stirrers in a laboratory setting are used for titration.

There's so much sulfite and other goodies in XTOL even a burly magnetic stirrer can get bogged and bounce the magnet around. Pain.

Low cost easy. Get a genuine Paterson stir paddle, warm your distilled water to 90°F ,add your powder and stir vigorously.

 

[mshchem]

Definitely not. Xtol contains a large amount of sulfites and sequestrants. In fact, that’s why it dissolves slowly. What can actually kill Xtol is the presence of metal ions - iron and copper. The sequestrants should take care of them, but still… Using tap water is far riskier than using a magnetic stirrer - tap water has a high level of dissolved oxygen, hydrogen compounds, carbonates, and potentially metal ions. Also, tap water can have significant pH variations. If you want peace of mind, just use deionized water.

I use a RO system, I fill gallon jugs and let it set for at least 24hrs to let (most) of the air come out, there's a lot of air dissolved in tap water.

You've made very good points here

 

[lamerko]

I've always hated dissolving large amounts of sulfite by hand stirring - it can take 15 minutes of constant stirring. Annoying. With my magnetic stirrer, I choose an appropriate stir bar depending on the beaker and the amount of powder. I always put in the thermometer probe, even though I often turn the heating plate off - the probe creates 'turbulence in the vortex', which makes the stirring more effective. I switch it on and let it stir on its own, while I put something on to watch in the meantime… ever since I got the stirrer, I've 'discovered hot water'