Does Bellatrix's knife count?

Just for the hell of it, I like to imagine them this way.
After all, there are dark magical objects suitable for creative torture, if one wishes to do it by magical stuff.

But I could see some using also non-magical impliments if grown up in the muggle sociaty. Although, I'm not sure how happy Voldemort would be about use of non-magical objects for these things, but seeing to that almost none of the Death Eaters actually shared his beliefs but served him for all their own individual motives, I can see them not caring much about Voldemort's prefered mehtods nor Voldemort about their prefered methods so long as they weren't ridiculing him or their collegues, and so long as they were attacking muggles and muggle-borns.

EDIT:

@ NightFrog:

If she ever used it to torture someone, then yes.

Bellatrix uses her dagger to torture people a lot.I wouldn't be surprised at all to hear that she used other methods.

I'm pretty sure of it. I can definitely see Bellatrix and Amycus & Alecto Carrow doing so, among others.

Right now, my mind is filled with pictures of Voldemort taking a bit of Pettigrews hand, Voldemort cutting out Harry's blood, Bellatrix holding her knife to Hermione's throat, Bellatrix's knife in Dobby's small body, and Pettigrew strangling himself to death...
And well, Hermione slapping Draco in the face. She's not a Death Eater, but still.

^
I don't think any of those are actual proof of canon anything.

"Voldemort taking a bit of Pettigrews hand"

Only because his flesh is needed to complete the ritual. This is not the same as torturing someone, or doing so for the hell of it.

"Voldemort cutting out Harry's blood"

Again, it had a motivation other than torture. Side note: it was Pettigrew cutting, not Voldemort.

"Bellatrix holding her knife to Hermione's throat"

In the book too?

"Bellatrix's knife in Dobby's small body"

Dobby's not human victim (as in completely differently lower creature in Death Eater eyes than a muggle/muggle-born human would be.) And again, it was for kill, not torture.

"and Pettigrew strangling himself to death..."

Again it was to kill, not torture.

"And well, Hermione slapping Draco in the face. She's not a Death Eater, but still."

No 'but stills'. The topic is on Death Eaters and their prefered/used/allowed mehtods in torturing their victims.

^I guess you're right then. But that was just what I thought of at the moment :)

^
Yup. :)

Bellatrix is certainly mad enough to use them