How could you differentiate a bubble from true specimen?

Question

anonymous · Answer

Need more info.

deepika.comet · Answer

$\small\color{magenta}\bigstar$   $\small\color{lightblue}\bigstar$    $\small\color{magenta}\bigstar$   $\small\color{lightblue}\bigstar$   $\small\color{magenta}\bigstar$   $\small\color{lightblue}\bigstar$   $\small\color{magenta}\bigstar$   $\small\color{lightblue}\bigstar$   $\small\color{magenta}\bigstar$   $\small\color{lightblue}\bigstar$   $\small\color{magenta}\bigstar$   $\small\color{lightblue}\bigstar$   $\small\color{magenta}\bigstar$   $\small\color{lightblue}\bigstar$   $\small\color{magenta}\bigstar$   $\small\color{lightblue}\bigstar$   $\small\color{magenta}\bigstar$   $\small\color{lightblue}\bigstar$   $\small\color{magenta}\bigstar$   $\small\color{lightblue}\bigstar$   

$\Huge\color{pink}{W}$$\Huge\color{violet}{e}$$\Huge\color{pink}{l}$$\Huge\color{violet}{c}$$\Huge\color{pink}{o}$$\Huge\color{violet}{m}$$\Huge\color{pink}{e}$     $\Huge\color{violet}{t}$$\Huge\color{pink}{o}$     $\Huge\color{violet}{O}$$\Huge\color{pink}{p}$$\Huge\color{violet}{e}$$\Huge\color{pink}{n}$$\Huge\color{violet}{S}$$\Huge\color{pink}{t}$$\Huge\color{violet}{u}$$\Huge\color{pink}{d}$$\Huge\color{violet}{y}$

$\small\color{magenta}\bigstar$   $\small\color{lightblue}\bigstar$    $\small\color{magenta}\bigstar$   $\small\color{lightblue}\bigstar$   $\small\color{magenta}\bigstar$   $\small\color{lightblue}\bigstar$   $\small\color{magenta}\bigstar$   $\small\color{lightblue}\bigstar$   $\small\color{magenta}\bigstar$   $\small\color{lightblue}\bigstar$   $\small\color{magenta}\bigstar$   $\small\color{lightblue}\bigstar$   $\small\color{magenta}\bigstar$   $\small\color{lightblue}\bigstar$   $\small\color{magenta}\bigstar$   $\small\color{lightblue}\bigstar$   $\small\color{magenta}\bigstar$   $\small\color{lightblue}\bigstar$   $\small\color{magenta}\bigstar$   $\small\color{lightblue}\bigstar$

deepika.comet · Answer

by vision

anonymous · Answer

I think they are meaning when using a light microscope, but I am not sure.  If that is the case, by vision will not always work.