Visually, you can't tell the difference between the Kahl and Sharp strains of albino. You need documented lineage from the breeder. Kahl is the more common strain by far. If you don't KNOW what line your albino is, it is safe to assume it's Kahl.
**Some say the Sharp line is brighter and holds color better than the Kahl line. Generally speaking that may be true to a certain extent, but I've seen some Kahls that absolutely blow Sharps out of the water. Selective breeding improves the individuals in any line. This is at least partly why we can't tell you with any certainty what line your albino is without documented lineage.