The most accurate way to titrate Fent, is to powder it. Take some powder (crushed tylenol/caffiene pills, baking powder/soda, B vitamin, lactose, ect), scrape all the gel into one corner of the patch, use a needle to poke a hole in that corner. Squirt the gel out and use toothpicks to stir the gel and powder together on a mirror/glass. Next, take a flexable "credit card" type card and smear the paste into a thin layer on the mirror. (kick the excess off the card) now use a hairdryer to dry dry the paste. Depending on how hot your hairdryer is, it should be bone-dry in 8-10 minutes. Every few minutes, touch the mixture. It's done when it is no longer tacky to the touch. Now it will be rock-hard and stuck to the plate. Take a razor blade and scrape the mixture off the mirror. By this time it will be in flake-form. Use either an upside-down pill bottle (using the cap), a lighter turned on its' side, or a coin. Grind the flakes into a superfine powder with the pill bottle/lighter/coin in a circular motion. WALLAH!!! China White! Since you're doing it anyway, be safe as possible.
Chao