I use the best quality stuff from BnQ tis a nice dark blackish colour that nicely resembles the Ash base that many railways used to use before the grey ballast.
Indoor or outdoor ? Raised ? If indoor my solution was to use potting gravel (edit - grit not gravel). Mix with some diluted PVA and fill like regular ballast. This is laid on regular indoor "grass mat" with bits of clumping material for weeds. Max
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