I have purchased 'Gold Cross' Fabric Dye - high temp for some tie dying. I read somewhere that I should use a 'fibre reactive' dye. Is this fibre reactive?

No. Gold Cross High Temp Fabric Dye is an all-purpose dye, which means it is a blend of acid dyes, which work on wool and silk but wash out of cotton, with direct dyes, which work on cotton but wash out of wool and nylon.

All-purpose dye is not nearly as good for tie-dyeing as fiber reactive dye. Gold Cross High Temp Fabric Dye requires thirty minutes of boiling with the fabric, which is an expensive thing to do since you should never reuse a cooking pot for food preparation after using fabric dyes in it. The cost of a very large non-aluminum cooking pot adds considerably to the cost of your dye project! This kind of dye fades quickly, often after only a few launderings, and the dark colors tend to bleed onto the light colors, which in some cases will ruin your tie-dye design.

The best dye to use for tie-dyeing is fiber reactive dye, such as Procion MX dye or Drimarene K dye. Go to a crafts store and look for a good tie dye kit. The Dylon Tie Dye Kit is good, as are tie dye kits made by Jacquard, Rainbow Rock, or Tulip. The best tie dye kits all contain cool water dyes which work at room temperature and do not require hot water.

For the best prices and the widest range of color choices, mail-order your fiber reactive dyes from a good dye supplier, such as PRO Chemical & Dye or Dharma Trading Company in the US, Batik Oetoro or KraftKolour in Australia, or Fibrecrafts or Rainbow Silks in the UK. See Sources for Dyeing Supplies Around the World.

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[Portions of this answer were also posted, by me, on Yahoo answers, on January 18, 2009.]