HC in Albinos is the result of selective breeding for the trait. Simply put, it is the result of other genes that impact the expression of contrast. No one has really looked at the inheritance pattern on these other genes but it is probably safe to say that at least some of them are likely to be inc-dom or dom in expression. That being the case, if you breed a HC to a LC then you will get a variety of expression from the offspring depending on how many of the HC-related genes each individual inherits but it is unlikely that any of the offspring will be as high in contrast as the original HC parent is (there are a couple exceptions to this but I am just going with the by-and-large likelihood.)