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Choose the correct letter, A, B or C. Project on using natural dyes to colour fabrics Jim eventually decided to do a practical
Choose the correct letter, A, B or C. Project on using natural dyes to colour fabrics Jim eventually decided to do a practical
admin
2018-05-28
55
问题
Choose the correct letter, A, B or C.
Project on using natural dyes to colour fabrics
Jim eventually decided to do a practical investigation which involved
TUTOR: OK, Jim. You wanted to see me about your textile design project.
JIM: That’s right. I’ve been looking at how a range of natural dyes can be used to colour fabrics like cotton and wool.
TUTOR: Why did you choose that topic?
JIM: Well, I got a lot of useful ideas from the museum, you know, at that exhibition of textiles. But I’ve always been interested in anything to do with colour. Years ago,
I went to a carpet shop with my parents when we were on holiday in Turkey, and I Q21 remember all the amazing colours.
TUTOR: They might not all have been natural dyes.
JIM: Maybe not, but for the project I decided to follow it up. And I found a great book about a botanic garden in California that specialises in plants used for dyes.
TUTOR: OK. So, in your project, you had to include a practical investigation.
JIM: Yeah. At first I couldn’t decide on my variables. I was going to just look at one type of fibre for example, like cotton ...
TUTOR: ... and see how different types of dyes affected it?
JIM: Yes.
Then I decided to include others as well, so I looked at cotton and wool and Q22 nylon.
TUTOR:
With just one type of dye?
JIM:
Various types
, including some that weren’t natural, for comparison.
TUTOR: OK.
JIM: So, I did the experiments last week. I used some ready-made natural dyes, I found a website which supplied them, they came in just a few days, but I also made some of my own.
TUTOR: That must have taken quite a bit of time.
JIM: Yes, I’d thought it’d just be a matter of a teaspoon or so of dye, and actually that wasn’t the case at all.
Like I was using one vegetable, beetroot, for a red dye, and I Q23 had to chop up a whole pile of it.
So it all took longer than I’d expected.
TUTOR: One possibility is to use food colourings.
JIM: I did use one. That was a yellow dye, an artificial one.
TUTOR: Tartrazine?
JIM: Yeah. I used it on cotton first. It came out a great colour,
but when I rinsed the Q24 material, the colour just washed away.
I’d been going to try it out on nylon, but I abandoned that idea.
TUTOR: Were you worried about health issues?
JIM: I’d thought if it’s a legal food colouring, it must be safe.
TUTOR: Well, it can occasionally cause allergic reactions, I believe.
TUTOR: So what natural dyes did you look at?
JIM: Well, one was turmeric. The colour’s great, it’s a really strong yellow. It’s generally used in dishes like curry.
TUTOR: It’s meant to be quite good for your health when eaten, but you might find
it’s not Q25 permanent when it’s used as a dve - a few washes, and it’s gone.
JIM: Right. I used beetroot as a dye for wool. When I chop up beetroot to eat I always end up with bright red hands,
but the wool ended up just a sort of watery cream Q26 shade.
Disappointing.
TUTOR: There’s a natural dye called Tyrian purple. Have you heard of that?
JIM: Yes. It comes from a shellfish, and it was worn in ancient times but only by important people as
it was so rare. I didn’t use it.
Q27
TUTOR:
It fell out of use centuries ago
, though one researcher managed to get hold of some recently. But that shade of purple can be produced by chemical dyes nowadays. Did you use any black dyes?
JIM: Logwood. That was quite complicated. I had to prepare the fabric so the dye would take.
TUTOR: I hope you were careful to wear gloves.
JIM: Yes. I know the danger with that dye.
TUTOR: Good.
It can be extremely dangerous if it’s ingested.
Now, presumably you had a Q28 look at an insect-based dye? Like cochineal, for example?
JIM: Yes. I didn’t actually make that, I didn’t have time to start crushing up insects to get the red colour and anyway they’re not available here, but I managed to get the dye quite easily from a website.
But it cost a fortune.
I can see why it’s generally just Q29 used in cooking, and in small quantities.
TUTOR: Yes, it’s very effective, but that’s precisely why it’s not used as a dye.
JIM: I also read about using metal oxide. Apparently you can allow iron to rust while it’s in contact with the fabric, and that colours it.
TUTOR: Yes, that works well for dying cotton. But you have to be careful as
the metal can Q30 actually affect the fabric
and so you can’t expect to get a lot of wear out of fabrics treated in this way. And the colours are quite subtle, not everyone likes them.
Anyway, it looks as if you’ve done a lot of work ...
选项
A、using a range of dyes with different fibres.
B、applying different dyes to one type of fibre.
C、testing one dye and a range of fibres.
答案
A
解析
首先听到定位词practical investigation,然后听到Jim说“At first I couldn’t decide on my variables…look at one type of fibre….”,其中one type of fiber对应B选项,但是通过at first可以排除B。接下来听到了逻辑信号词then,对应提示词eventually,之后听到Jim说“I decided to include other as well,so I looked at cotton and wool and nylon.”,导师问“With just one type of dye?”,Jim答“Various types.”,其中various types对应A选项的a range of dyes,cotton and wool and nylon对应different fibres,因此答案为A。另外,C选项在文中未提及。
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