composition

Help with Swashes, please!

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Please help! Are there any rules or formatting structures for using swashes to fill in negative space for a scrip or brush layout? Like are there any tips or do-and-don'ts of creation? I want to use some to add to my layout but i don't know where to begin or which ones to use if the font does not contain alternates or glyphs included in the original. Thanks in advance!