negra sale negro

[barneygoober]

Hello: Is there some idiomatic translaton for this phrase?
Complete sentence is: Usando la lampara violeta o negra sale negro, no brillo como el fluorescente. It has to do with stamps and their appearance under ultraviolet light. Thanks, Me

 

[Fantasmagórico]

I think there is a comma missing: “Usando la lampara violeta o negra, sale negro”

The entire sentence seems confusing to me, but I think it means: “it doesn’t glow under the UV light”.

 

[barneygoober]

Hello and thanks. Yes, it makes much more sense with the comma you suggested. This particular type of stamp should not glow under UV or blacklight. Thanks very much

 

[Eucarionte]

In my opnion, negra sale negro, has to do with a kind of lamp, more precisely a kind of light which was called black light. It was very popular in the 70's and was commonly used when encoding a message written with a special marker which was "invisible" except when exposed to that light.