Adding loading/tracking dye to PCR mix? - (Jul/10/2011 )
Add some cresol red dye to your pcr mix. This stain migrates at 1000bp on 1% agarose gels and does not inhibit taq. If you need a little more density for easy gel loading add 5% glycerol also.
See also: (1) Hoppe, B.L. et al. (1992) Biotechniques 12, 679-680
Gel-Loading Dyes Compatible with PCR.
Hope this helps