Custom field without price (show word "free")

When I create new custom field (color) of product and in the price I put blank (attached 1) on me down the word "free" "gratis" (attached 2) as I can remove it "free"? but no price increase to add that field? Thanks

Can you describe your problem better?

Sorry for my English I am Spanish, I use google translate. Let's see if I explain better:
- I think a number of custom fields in the attribute product with different color codes (1, 1A, 2). (attach 1)
- These fields can be selected in the dropdown when you buy a product (attach 2).
- I do not want to increase the price of the product, so colors to create the attributes put blank in the price of these attributes. (attach 1)
- The problem is to leave the price blank in the drop down I get the word "GRATIS"/"free" next to the color code, which is very bad. I want you to just leave the code without the word FREE (ATACH 2)
It has been understood? thanks

Tell that word "GRATIS/free" if probably located in some language ini file. Simplest thing is just to put blank for it's label. It is in some ini that has virtuemart in it's name.

/languages/<lng-suffix>/