to NGA
If you nick the embryo the seeds will rot.
When I scarify small seeds (grape seeds fit my definition of small), I use my emory board. The whole idea of seed scarification is to get through the top coating of the seed. It doesn't take much - a couple rubs on the emory board will do it.
If its a large seed, use the nail clippers. Taking a little nip out of the tip will be enough.
