From the search results, it is difficult to find specific product details or ingredients for Halloween ombre nails. However, there are some positive and negative reviews for press-on nails and tutorials on how to create the look. Here are some key points from the search results:

• Positive reviews: Customers on Etsy have left positive reviews for Halloween ombre press-on nails, describing them as "high quality" and with "exquisite details". One Amazon customer also left a positive review for a set of Halloween-themed press-on nails, saying that they "come with glue" and that they used it successfully.

• Negative reviews: One Amazon customer left a negative review for a set of Halloween press-on nails, saying that they were "dissatisfied" with the product.

• Tutorials: There are several tutorials available on YouTube for creating Halloween ombre nail art, using techniques such as stamping and calligraphy pens.

Overall, it seems that Halloween ombre nails are a popular choice for the spooky season, but specific product details and ingredients are not readily available from the search results.