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The slash should be cut at an approximately 30° angle, just before baking, in order to form a good 'ear'. Hers may have disappeared because the loaf was not proofed enough, the cut was not angled enough or deep enough. HERE's a good page about the topic, showing the results of different slashes.
BTW, the white stripes are rice flour added at the last minute, it does not brown.
The slash should be cut at an approximately 30° angle, just before baking, in order to form a good 'ear'. Hers may have disappeared because the loaf was not proofed enough, the cut was not angled enough or deep enough. HERE's a good page about the topic, showing the results of different slashes.
