Why does the metal on ice cream scoops turn fuzzy?

[glen]

Surely someone else has noticed this.

 

[HamburgerBoy]

Because it is exposed to excess cold, which results in microfracturing of the metals. Any metal utensil would behave the same way, were they frequently exposed to ice cream conditions.

 

[Whoozyerdaddy]

*facepalm*

 

[PlasmaBomb]

You mean why does water vapour condense out of the air and freeze on the freezing metal?

I have no idea why that could possibly happen...

 

[ussfletcher]

You mean why does water vapour condense out of the air and freeze on the freezing metal?

I have no idea why that could possibly happen...

I don't think that's what hes referring to.

 

[shortylickens]

FUCK YOU!
Now I need ice cream.

Jackass!

 

[DrPizza]

I know what you mean, and I'm unsure what causes it. Never gave it much thought. To the replies from idiots who don't know what the OP is referring to, I've worked at a restaurant that had good ice cream scoops. They started out as smooth as any other utensil, but within 5 years or so, the surface was anything but smooth. I'm not quite sure I would have used the term "fuzzy", but it works.

My best guess is the constant swings in temperature from 0 degrees F in the ice cream, back to room temperature water. But on the other hand, other utensils are going from room temp to 180+ degrees.

 

[glen]

How do we post pictures here these days?

 

[jman19]

*facepalm*

Huh? it's a question with a non-obvious answer.

 

[Jeff7]

http://en.wikipedia.org/wiki/Dendrite_(metal) ?

How do we post pictures here these days?

http://pics.bbzzdd.com

 

[gaidensensei]

I thought there's a good amount of salt used in the ice cream manufacturing process..
Common knowledge is that salt -> oxidizes and rusts metal when in contact with water and oxygen.

I don't know about fuzzy though, I only notice specks on my oldest ice cream utensil.

 

[sdifox]

I thought there's a good amount of salt used in the ice cream manufacturing process..
Common knowledge is that salt -> oxidizes and rusts metal when in contact with water and oxygen.

I don't know about fuzzy though, I only notice specks on my oldest ice cream utensil.

err, nothing to do with the salt... that salt was not in the ice cream :biggrin:

 

[gaidensensei]

err, nothing to do with the salt... that salt was not in the ice cream :biggrin:

My friend, in the ice cream.

Ice cream is a complex food colloid in that the mix emulsion is subsequently foamed, creating a dispersed phase of air bubbles, and is frozen, forming another dispersed phase of ice crystals. Air bubbles and ice crystals are usually in the range of 20 to 50 μm (Caldwell et at., 1992). The serum phase consists of the unadsorbed casein micelles in suspension in a freeze concentrated solution of sugars, unadsorbed whey proteins, salts and high molecular mass polysaccharides. In addition, the partially-crystalline fat phase at refrigerated temperatures undergoes partial coalescence during the concomitant whipping and freezing process, resulting in a network of agglomerated fat, which partially surrounds the air bubbles and gives rise to a solid-like structure (Kalab, 1985; Goff and Jordan, 1989; Boode and Walstra.1993) Various steps in the manufacturing process, including pasteurization, homogenization, aging, freezing and hardening, contribute to the development of this structure.

 

[sdifox]

My friend, in the ice cream.

salts <> table salt.

Salt + ice is what you use to chill the actual churn bucket.

 

[Whoozyerdaddy]

Huh? it's a question with a non-obvious answer.

Are you kidding? Warm moist air hits a cold metal surface... fuzzy! It's called frost.

 

[sdifox]

Are you kidding? Warm moist air hits a cold metal surface... fuzzy! It's called frost.

I don't think he is talking about frost...

 

[Whoozyerdaddy]

I don't think he is talking about frost...

WTF else could he possibly be talking about? It's an ice cream scoop.

 

[Fenixgoon]

Because it is exposed to excess cold, which results in microfracturing of the metals. Any metal utensil would behave the same way, were they frequently exposed to ice cream conditions.

in homogenous nucleation (growing a crystal in a vacuum/perfectly neutral environment), you need an undercooling (cool below the freezing point) to drive nucleation and growth.

in the case of the metal spoon, it provides some surface energy allowing for easier growth of ice crystals (heterogeneous nucleation). since you have an entire surface on which to grow the nuclei of ice, you get many small ice crystals.

if i'm not mistaken. thermodynamics and kinetics were never my strong point

 

[sdifox]

WTF else could he possibly be talking about? It's an ice cream scoop.

The surface of the scoop turns fuzzy. Physical change to the scoop, not just condensation.

 

[shortylickens]

 

[guyver01]

Why does the metal on ice cream scoops turn fuzzy?

stop using your Cat to dry it off.

sheesh.

 

[0roo0roo]

err, nothing to do with the salt... that salt was not in the ice cream :biggrin:

salt enhances sweet, it is weird.



but srsly, who is going to post pics of this supposed phenomenon.

i don't buy temperature explanation, ice cream just isn't that cold.

 

[jman19]

Are you kidding? Warm moist air hits a cold metal surface... fuzzy! It's called frost.

Um, no.

 

[ussfletcher]

This is not a unique phenomenon, however I do not have any pictures of the effect... apparently google doesn't know much about it either. I have however seen this effect on multiple scoops.