Great question!
When a recipe calls for "gelatine mass" (which is usually a pre-hydrated mixture of 1 part gelatin to 5 parts water), it is typically based on a standard professional bloom strength—usually Gold (200 bloom) or Platinum (230-250 bloom).
Since you are using Silver grade (160 bloom), you'll need to use slightly more gelatin to achieve the same "setting" power.

To keep the math simple, we use the Bloom Strength conversion formula:
Mass_2 = Mass_1 X V--{Bloom_1}/{Bloom_2}}
The ConversionAssuming the original recipe's "30 g gelatine mass" was calculated using Gold gelatin (200 bloom), here is your adjustment for Silver (160 bloom):
- Original Gelatine Mass: 30 g
- Conversion Factor: approximately 1.12x
- Your New Gelatine Mass: 33.6 g

IMPORTANT
To make this 33.6 g of Gelatine Mass using your Silver gelatin, mix 5.6 g of Silver gelatin powder with 28 g of cold water. Let it bloom completely before adding it to your hot glaze.

Why this matters for your Mirror Glaze
- Texture: If you don't adjust for the lower bloom, your glaze might be too "runny" and slide off the sides of your frozen pastry.
- Clarity: Silver gelatin is slightly less "refined" than Gold or Platinum, but in a deep, dark cocoa glaze like this one, it won't affect the visual results at all.
- The "Drip" Test: As the tutorial mentions, wait until the glaze stops dripping before moving the pastry. If you find it’s still too fluid at 35°C, let it cool to 32°C before pouring next time.