Why Do Tattoos Look Blue?

hiii so i'm planning on getting a tattoo of a really cool tribal cross on my wrist. i want it to be just a simple black cross. but i have been noticing that most peoples tattoos that are prescription drugs online without a prescription supposed to be black appear to be blue, does anyone know why is this is. I dont want to walk around with a blue cross on my wrist, i just want it to be black! please someone help me!

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TRIBAL RADIANT CROSS TEMPORARY TATTOO 9020    US $1.00

TRIBAL CROSS BLACK RED LARGE TEMPORARY TATTOO 20019    US $1.30

TRIBAL AWESOME HALOGRAPHIC CROSS TEMPORARY TATTOO 21099    US $1.30