Sorry, I haven't been on this forum in a long time... I found the Alpha Cards topic while searching the web!
Lets go over a few basic points:
The ink can only go 90% clear, thats the nature of the technology.
You need to have really warm hands to use
just your hands.
Flashpaper will ruin the card, so I recommend using a lighter's flame right up on the card and keeping the flame in motion. I explain all of this in my instructions.
I recommend purchasing some hand/glove warmers, the type they sell at ski shops. You can find them anywhere these days, Costco, Walmart, CVS, etc... You can hide these small/flat heat packs in your card case or under a closeup pad. When you throw an Alpha Card on top, it changes into hearts REALLY well! They even make reusable heat packs, they are a larger size, so you'd have to hide it in an empty card box on the table. They even make cold reusable packs, for people that live/work in a really hot environment.
Alpha Cards should be used in 85F temperature or under. Not too under, or you will have a hard time heating up the card. It is important that you are heating both the card stock and the spades evenly.
Try your Alpha Cards over a cup of coffee!
Always incorporate a T*p C***ge or favorite sw**ch after you have heated up the Alpha Card. You can then give it one more shake to "complete the transition". This does not replace sleight of hand, it just enhances it

The tail should not be an issue, its more a sign that the spade is fading away. If it were real magic, it would probably leave a mark right? haha
Please email me if you have any questions, or wanna jam on some ideas! Thanks again for all the support guys, and visit my new website sometime! Lots of more things planned with the Alpha Cards idea too... I'll let you know more soon!