gelatin 160 bloom converts to...what? need your help...

30 gr = 30 gr. It's a weight issue. That's why I like using weight measure for dry ingredients rather than cups or...1 pound always equals 1 pound no matter what it is.

Gelatin seems pretty straightforward unless there's something different about Kosher gelatin (coming from an animal rather than ?) as far as density. But if they say it's the same then go with it.

April

 

According to http://books.google.com/books?id=4u...epage&q=gelatin bloom sheet to powder&f=false , 17 sheets of gelatin (gold, silver, bronze, makes no difference) = 1 ounce (28 grams) of gelatin powder. IMPORTANT! That does NOT say 28 grams of leaf gelatin is equal to 28 grams of powder.

In "googling", it appears that the various "blooms" of sheet gelatin, i.e. gold, silver, bronze, etc., have sheet weights that are inversely proportional to the bloom number so that the same number of sheets, whatever the "bloom", will set the same amount of liquid. Though the number of sheets may be the same, the "weight" of bronze sheets will be greater than the weight of the same number of "gold" sheets.

So, for me, that means that for every "sheet" of gelatin called for, I need 1.65 grams of powder or,

• 1 sheet = 1.65 grams of powder
• 2 sheets = 3.3 grams of powder
• 3 sheets = 4.95 grams of powder (I'd use 5 grams)
• 4 sheets = 6.59 grams of powder (I'd use 6.6 grams)
• 5 sheets = 8.25 grams of powder

and the grade of the sheet gelatin, i.e. gold, silver, bronze, makes no difference, AS LONG AS ONE REPLACES SHEETS OF GELATIN WITH GRAMS OF POWDER!

 

30 grams (silver) * SqRoot(160/225) = ?? grams powder

30 grams (silver) * 0.843274 = 25.3 grams powder

17 sheets of silver = 28 grams of powder

therefore

12 sheets = 12/17*28 grams of powder or 19.76 grams of powder

Hm, that's a good amount of difference!

Not being a "baker", but a "reformed engineer turned chef", I'm not sure which is correct, or even close!

Maybe you should try "splitting the difference, i.e. 25.3+19.8 = 22.6 grams, as a starting point?

 

Ahhhh, so that is what the gold, silver, and bronze sheets are.  If I understand correctly, "gold" would be at a higher bloom strength, but the sheet would be thinner because less of it is required to set up, say, a mousse.

I do know that "bloom" refers to the strength of the set gelatin.  I researched "bloom" and found a lot of information relating to Hide Glue--gelatin's direct cousin, which was pateneted by Peter Cooper, who also patented various techniqus for making hide glue.  The "secret recipie" for gelatine was sold to numerous people until General Foods bought it and changed the name to "Jell-o".

According to my research, Oscar T. Bloom invented the "Gelometer" which he patented in 1926.: A 6 2/3 weight percentage solution is used to test food grade and photography grade gelatin, and the results are expressed in grams bloom.  Basically a 1/2" dia. plunger is used to plunge a depth of 3/16" into the gelatin.  Lead shot is poured into a hopper, and when the plunger reaches 3/16", the amount of lead in the hoper is wieghed. 

While reading up on this, I foud a "quaint" recipie for converting Knox Gelatin into woodworking glue...............

Anyone in the mood for a bowl of jello?

 

You soooooooooooooo suck at math. 

160/2.5 is not 12, it's 64.  At least in this universe. On the other hand, 30/2.5 is 12. 

Don't feel too bad, other people soooooooooooo suck at gelatin.  Mass for mass not all gelatines are created equal.  Some are more efficient than others -- that is, they can gel a greater amount of liquid.

There is a formula for converting various forms of sheet to various forms of powder.  Here goes:

Weight (Bloom 2) = Weight (Bloom 1) x square root (Bloom1/Bloom2)

You're undoubtedly much better at pastry than I am, but I'm pretty good at 'rithmetic.  So I worked it out for you.  Mass for mass, Knox gelatin powder is roughly 1.2X more efficient than 160 bloom sheet gelatin. Conversely (and reciprocally), it might also help you to know that 160 bloom sheet gelatin is roughly 0.8X as efficient as Knox gelatin powder. 

Thus, to answer your specific question directly, 30 grams of 160 sheet is roughly equivalent to 25 grams of Knox powder.  

It doesn't do to rely on conversion numbers or gelatin amounts too carefully.  There's a certain amount of by God and by Gosh in most recipes, and they usually specify a little more than is absolutely needed just to be sure.  Unless you're making something with a very soft texture which will be very carefully held (pannacotta, fine dining, e.g.) it's better to continue with "better safe than sorry."

When cooking with gelatin conversions a little too much is better than even a bit too little.

25g is on the money.  If you measure 30 grams instead of 25, that won't be too bad.  Just under 20g -- which is your proposal -- might be a little risky.

Hope this helps,

BDL

PS.  Since you asked, Pete's "225" is the bloom number for Knox powdered gelatin.

 

Mmm, I don't believe it changes anything, everything I've found talks about "gelatin powder", not specific brands, and almost without exception, the "bloom" is 225.

Now, TBS, I'd listen to BDL
 

 

If not Knox, what?

If we can find the bloom number, we can work the math.

BDL

 

OK, ya know I grew up where gelatin was gelatin. To be honest I have never run into strengths of a bloomin sheet! LOL.

All I've ever used was gelatin and it worked fine for mousse, stabilized whipped cream, certain pie fillings or whatnot....hmmmm....

Just one more culinary curiosity to look into.

April

 

Gelatin is denatured collagen that has been dried out and made into sheets or powder. Strengths are affected by salt, it lowers the bonding capacity whereas sugar increases it .Milk protein makes gel stronger.. It is used in so many applications today, and modified in so many ways that you would need a full page to list them all.

 

Yup. 

Don't forget certain acids like fresh pineapple, and fresh kiwi will "kill" the gelatine as well.

 

Since those two and papaya are used to tenderise 'cos of one or two enzymes they contain then they probably breakdown the very connective tissue gelatine is originally made from.

I couldn't set a tamarind pannacotta but a friend's brullee was fine and didnt curdle....enzymes maybe?

 

Alcohol will make gelatin gel better. BUT over 20% alcohol will make it break off in chunks and stone like pieces.