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Choose the correct letter, A, B or C. Project on using natural dyes to colour fabrics When doing his experiments, Jim was surpr
Choose the correct letter, A, B or C. Project on using natural dyes to colour fabrics When doing his experiments, Jim was surpr
admin
2018-05-28
76
问题
Choose the correct letter, A, B or C.
Project on using natural dyes to colour fabrics
When doing his experiments, Jim was surprised by
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、how much natural material was needed to make the dye.
B、the fact that dyes were widely available on the internet.
C、the time that he had to leave the fabric in the dye.
答案
A
解析
首先Jim提到了定位词experiment,然后提到了“I used some ready-made natural dyes,I found a website which supplied them.”(与B选项部分重叠),但这并不是Tim感到surprised的点,可排除B;接下来,导师提到“That must have taken quite a bit of time.(它们肯定相当耗费时间。)”,对应C选项time部分,但C选项说的时间是把布料放入染料的时间,而非原文中Jim做整个实验的时间,因此可以排除C。最后Jim提到“Like I was using one vegetable,beetroot,for a red dye,and I had to chop up a whole pile of it.(像是我本以为红色的染料仅需一棵甜菜根即可,结果我用掉了一整堆的甜菜根。)”,其中a whole pile of对应A选项的how much,beetroot对应natural material,for a red dye对应make the dye,因此答案为A。
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